Updated travis.yml to run on PHP7

.travis.yml

@@ -5,16 +5,7 @@ php:
   - 5.5
   - 5.6
   - 7.0
-#  - hhvm
-#  - hhvm-nightly
-
-# run build against hhvm but allow them to fail
-# http://docs.travis-ci.com/user/build-configuration/#Rows-That-are-Allowed-To-Fail
-matrix:
-  fast_finish: true
-  allow_failures:
-#    - php: hhvm-nightly
-    - php: 7.0
+  - hhvm
 
 # faster builds on new travis setup not using sudo
 sudo: false