Merge pull request #130 from br00k/fix/update-testing

add testing for php 5.6 and hhvm (allow failures)

.travis.yml

@@ -4,6 +4,12 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - 5.6
+  - hhvm
+
+matrix:
+  allow_failures:
+    - php: hhvm
 
 before_script: composer install