Refactor for a cleaner code, less is more in this regard!

contracts/Authentication.sol

@@ -1,8 +1,8 @@
 pragma solidity ^0.4.2;
 
-import './zeppelin/lifecycle/Killable.sol';
+import 'zeppelin-solidity/contracts/lifecycle/Destructible.sol';
 
-contract Authentication is Killable {
+contract Authentication is Destructible {
   struct User {
     bytes32 name;
   }

migrations/2_deploy_contracts.js

@@ -1,11 +1,5 @@
-var Ownable = artifacts.require("./zeppelin/ownership/Ownable.sol");
-var Killable = artifacts.require("./zeppelin/lifecycle/Killable.sol");
 var Authentication = artifacts.require("./Authentication.sol");
 
 module.exports = function(deployer) {
-  deployer.deploy(Ownable);
-  deployer.link(Ownable, Killable);
-  deployer.deploy(Killable);
-  deployer.link(Killable, Authentication);
   deployer.deploy(Authentication);
 };

package.json

@@ -55,7 +55,8 @@
     "react-router-redux": "^4.0.7",
     "redux": "^3.6.0",
     "redux-auth-wrapper": "^1.0.0",
-    "redux-thunk": "^2.2.0"
+    "redux-thunk": "^2.2.0",
+    "zeppelin-solidity": "^1.10.0"    
   },
   "scripts": {
     "start": "node scripts/start.js",