Support HHVM 3.24

Summary:
- remove bin/: no longer used, and not compatible with CTPBR
 - update all dependencies to 3.24-compatible versions
 - update .hhconfig to test 3.24 flags
Closes #44

Reviewed By: periodic1236

Differential Revision: D6668942

Pulled By: periodic1236

fbshipit-source-id: 2a007d47ccc19ba2ca63194133d90ec13b562e91

.hhconfig

@@ -1 +1,3 @@
 assume_php=false
+enable_experimental_tc_features = safe_pass_by_ref, safe_array, safe_vector_array, contextual_inference
+ignored_paths = [ "vendor/.+/tests/.+" ]

.travis.sh

@@ -10,10 +10,5 @@ hh_server --check $(pwd)
 hhvm -d hhvm.php7.all=0 -d hhvm.jit=0 vendor/bin/phpunit
 hhvm -d hhvm.php7.all=1 -d hhvm.jit=0 vendor/bin/phpunit
 
-hhvm -d hhvm.jit=0 bin/generate-docs.php $(mktemp -d)
-
-HHVM_VERSION=$(hhvm --php -r 'echo HHVM_VERSION_ID;' 2>/dev/null);
-if [ $HHVM_VERSION -ge 32200 -a $HHVM_VERSION -lt 32300 ]; then
-  echo enable_experimental_tc_features = optional_shape_field, unknown_fields_shape_is_not_subtype_of_known_fields_shape >> .hhconfig
-  hh_server --check $(pwd)
-fi
+sed -i '/enable_experimental_tc_features/d' .hhconfig
+hh_server --check $(pwd)