diff --git a/.gitignore b/.gitignore
index 0639a26..9576292 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 node_modules
 installed_contracts
 seed
+build
+
diff --git a/contracts/EthPolynomialCurvedToken.sol b/contracts/EthPolynomialCurvedToken.sol
index 9991332..291ab1e 100644
--- a/contracts/EthPolynomialCurvedToken.sol
+++ b/contracts/EthPolynomialCurvedToken.sol
@@ -26,7 +26,7 @@ contract EthPolynomialCurvedToken is EthBondingCurvedToken {
 
     /// @dev        Calculate the integral from 0 to t
     /// @param t    The number to integrate to
-    function curveIntegral(uint256 t) internal returns (uint256) {
+    function curveIntegral(uint256 t) internal view returns (uint256) {
         uint256 nexp = exponent + 1;
         // Calculate integral of t^exponent
         return PRECISION.div(nexp).mul(t ** nexp).div(PRECISION);
diff --git a/contracts/PolynomialCurvedToken.sol b/contracts/PolynomialCurvedToken.sol
index 5ca7c8d..a666fcd 100644
--- a/contracts/PolynomialCurvedToken.sol
+++ b/contracts/PolynomialCurvedToken.sol
@@ -28,7 +28,7 @@ contract PolynomialCurvedToken is BondingCurvedToken {
 
     /// @dev        Calculate the integral from 0 to t
     /// @param t    The number to integrate to
-    function curveIntegral(uint256 t) internal returns (uint256) {
+    function curveIntegral(uint256 t) internal view returns (uint256) {
         uint256 nexp = exponent + 1;
         // Calculate integral of t^exponent
         return PRECISION.div(nexp).mul(t ** nexp).div(PRECISION);
diff --git a/contracts/TestToken.sol b/contracts/TestToken.sol
index 3e2419d..a8b5e68 100644
--- a/contracts/TestToken.sol
+++ b/contracts/TestToken.sol
@@ -1,3 +1,4 @@
+
 pragma solidity ^0.4.23;
 
 import "openzeppelin-solidity/contracts/token/ERC20/DetailedERC20.sol";
@@ -8,5 +9,5 @@ contract TestToken is MintableToken, DetailedERC20 {
     string name,
     string symbol,
     uint8 decimals
-  ) DetailedERC20(name, symbol, decimals) {}
+  ) DetailedERC20(name, symbol, decimals) public {}
 }
diff --git a/package-lock.json b/package-lock.json
index 86572d1..31a063b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,16 +10,25 @@
       "integrity": "sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==",
       "dev": true,
       "requires": {
-        "call-me-maybe": "1.0.1",
-        "glob-to-regexp": "0.3.0"
+        "call-me-maybe": "^1.0.1",
+        "glob-to-regexp": "^0.3.0"
       }
     },
     "@nodelib/fs.stat": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-1.0.2.tgz",
-      "integrity": "sha512-vCpf75JDcdomXvUd7Rn6DfYAVqPAFI66FVjxiWGwh85OLdvfo3paBoPJaam5keIYRyUolnS7SleS/ZPCidCvzw==",
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz",
+      "integrity": "sha512-shAmDyaQC4H92APFoIaVDHCx5bStIocgvbwQyxPRrbUY20V1EYTbSDchWbuwlMG3V17cprZhA6+78JfB+3DTPw==",
       "dev": true
     },
+    "@samverschueren/stream-to-observable": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@samverschueren/stream-to-observable/-/stream-to-observable-0.3.0.tgz",
+      "integrity": "sha512-MI4Xx6LHs4Webyvi6EbspgyAb4D2Q2VtnCQ1blOJcoLS6mVa8lNN2rkIy1CVxfTUpoyIbCTkXES1rLXztFD1lg==",
+      "dev": true,
+      "requires": {
+        "any-observable": "^0.3.0"
+      }
+    },
     "@sindresorhus/is": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.7.0.tgz",
@@ -32,7 +41,7 @@
       "integrity": "sha512-2++wDf/DYqkPR3o5tbfdhF96EfMApo1GpPfzOsR/ZYXdkSmELlvOOEAl9iKkRsktMPHdGjO4rtkBpf2I7TiTeA==",
       "dev": true,
       "requires": {
-        "xtend": "4.0.1"
+        "xtend": "~4.0.0"
       }
     },
     "aes-js": {
@@ -42,21 +51,21 @@
       "dev": true
     },
     "ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "version": "6.10.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.0.tgz",
+      "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "fast-deep-equal": "1.1.0",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.3.1"
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "ansi-escapes": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
-      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true
     },
     "ansi-regex": {
@@ -71,13 +80,13 @@
       "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
       "dev": true,
       "requires": {
-        "color-convert": "1.9.1"
+        "color-convert": "^1.9.0"
       }
     },
     "any-observable": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/any-observable/-/any-observable-0.2.0.tgz",
-      "integrity": "sha1-xnhwBYADV5AJCD9UrAq6+1wz0kI=",
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/any-observable/-/any-observable-0.3.0.tgz",
+      "integrity": "sha512-/FQM1EDkTsf63Ub2C6O7GuYFDsSXUwsaZDurV0np41ocwq0jthUAYCmhBX9f+KwlaCgIuWyr/4WlUQUBfKfZog==",
       "dev": true
     },
     "arr-diff": {
@@ -86,7 +95,7 @@
       "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
       "dev": true,
       "requires": {
-        "arr-flatten": "1.1.0"
+        "arr-flatten": "^1.0.1"
       }
     },
     "arr-flatten": {
@@ -113,7 +122,7 @@
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
       "dev": true,
       "requires": {
-        "array-uniq": "1.0.3"
+        "array-uniq": "^1.0.1"
       }
     },
     "array-uniq": {
@@ -135,10 +144,13 @@
       "dev": true
     },
     "asn1": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
-      "dev": true
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
     },
     "assert-plus": {
       "version": "1.0.0",
@@ -153,9 +165,9 @@
       "dev": true
     },
     "ast-types": {
-      "version": "0.11.3",
-      "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.11.3.tgz",
-      "integrity": "sha512-XA5o5dsNw8MhyW0Q7MWXJWc4oOzZKbdsEJq45h7c8q/d9DwWZ5F2ugUc1PuMLPGsUnphCt/cNDHu8JeBbxf1qA==",
+      "version": "0.11.5",
+      "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.11.5.tgz",
+      "integrity": "sha512-oJjo+5e7/vEc2FBK8gUalV0pba4L3VdBIs2EKhOLHLcOd2FgQIVQN9xb0eZ9IjEWyAL7vq6fGJxOvVvdCHNyMw==",
       "dev": true
     },
     "async": {
@@ -170,17 +182,23 @@
       "integrity": "sha512-pd20BwL7Yt1zwDFy+8MX8F1+WCT8aQeKj0kQnTrH9WaeRETlRamVhD0JtRPmrV4GfOJ2F9CvdQkZeZhnh2TuHw==",
       "dev": true,
       "requires": {
-        "async": "2.6.0"
+        "async": "^2.4.0"
       },
       "dependencies": {
         "async": {
-          "version": "2.6.0",
-          "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
-          "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+          "version": "2.6.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.2.tgz",
+          "integrity": "sha512-H1qVYh1MYhEEFLsP97cVKqCGo7KfCyTt6uEWqsTBr9SO84oK9Uwbyd/yCW+6rKJLHksBNUVWZDAjfS+Ccx0Bbg==",
           "dev": true,
           "requires": {
-            "lodash": "4.17.10"
+            "lodash": "^4.17.11"
           }
+        },
+        "lodash": {
+          "version": "4.17.11",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+          "dev": true
         }
       }
     },
@@ -197,9 +215,9 @@
       "dev": true
     },
     "atob": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.1.tgz",
-      "integrity": "sha1-ri1acpR38onWDdf5amMUoi3Wwio=",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
+      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
       "dev": true
     },
     "aws-sign2": {
@@ -209,9 +227,9 @@
       "dev": true
     },
     "aws4": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.7.0.tgz",
-      "integrity": "sha512-32NDda82rhwD9/JBCCkB+MRYDp0oSvlo2IL6rQWA10PQi7tDUM3eqMSltXmY+Oyl/7N3P3qNtAlv7X0d9bI28w==",
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
+      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
       "dev": true
     },
     "babel-code-frame": {
@@ -220,9 +238,9 @@
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
       "dev": true,
       "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
       },
       "dependencies": {
         "ansi-regex": {
@@ -243,11 +261,11 @@
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
-            "ansi-styles": "2.2.1",
-            "escape-string-regexp": "1.0.5",
-            "has-ansi": "2.0.0",
-            "strip-ansi": "3.0.1",
-            "supports-color": "2.0.0"
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
           }
         },
         "strip-ansi": {
@@ -256,7 +274,7 @@
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         },
         "supports-color": {
@@ -273,25 +291,25 @@
       "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
       "dev": true,
       "requires": {
-        "babel-code-frame": "6.26.0",
-        "babel-generator": "6.26.1",
-        "babel-helpers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-register": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "babylon": "6.18.0",
-        "convert-source-map": "1.5.1",
-        "debug": "2.6.9",
-        "json5": "0.5.1",
-        "lodash": "4.17.10",
-        "minimatch": "3.0.4",
-        "path-is-absolute": "1.0.1",
-        "private": "0.1.8",
-        "slash": "1.0.0",
-        "source-map": "0.5.7"
+        "babel-code-frame": "^6.26.0",
+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.8",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.7"
       },
       "dependencies": {
         "babylon": {
@@ -314,14 +332,14 @@
       "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
       "dev": true,
       "requires": {
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "detect-indent": "4.0.0",
-        "jsesc": "1.3.0",
-        "lodash": "4.17.10",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "detect-indent": "^4.0.0",
+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
+        "source-map": "^0.5.7",
+        "trim-right": "^1.0.1"
       },
       "dependencies": {
         "jsesc": {
@@ -344,9 +362,9 @@
       "integrity": "sha1-FMGeXxQte0fxmlJDHlKxzLxAozA=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-builder-binary-assignment-operator-visitor": {
@@ -355,9 +373,9 @@
       "integrity": "sha1-zORReto1b0IgvK6KAsKzRvmlZmQ=",
       "dev": true,
       "requires": {
-        "babel-helper-explode-assignable-expression": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-explode-assignable-expression": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-call-delegate": {
@@ -366,10 +384,10 @@
       "integrity": "sha1-7Oaqzdx25Bw0YfiL/Fdb0Nqi340=",
       "dev": true,
       "requires": {
-        "babel-helper-hoist-variables": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-hoist-variables": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-define-map": {
@@ -378,10 +396,10 @@
       "integrity": "sha1-pfVtq0GiX5fstJjH66ypgZ+Vvl8=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.10"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-explode-assignable-expression": {
@@ -390,9 +408,9 @@
       "integrity": "sha1-8luCz33BBDPFX3BZLVdGQArCLKo=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-explode-class": {
@@ -401,10 +419,10 @@
       "integrity": "sha1-fcKjkQ3uAHBW4eMdZAztPVTqqes=",
       "dev": true,
       "requires": {
-        "babel-helper-bindify-decorators": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-bindify-decorators": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-function-name": {
@@ -413,11 +431,11 @@
       "integrity": "sha1-00dbjAPtmCQqJbSDUasYOZ01gKk=",
       "dev": true,
       "requires": {
-        "babel-helper-get-function-arity": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-get-function-arity": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-get-function-arity": {
@@ -426,8 +444,8 @@
       "integrity": "sha1-j3eCqpNAfEHTqlCQj4mwMbG2hT0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-hoist-variables": {
@@ -436,8 +454,8 @@
       "integrity": "sha1-HssnaJydJVE+rbyZFKc/VAi+enY=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-optimise-call-expression": {
@@ -446,8 +464,8 @@
       "integrity": "sha1-96E0J7qfc/j0+pk8VKl4gtEkQlc=",
       "dev": true,
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