Added all PHP versions into travis tests

Author: 66Ton99

.travis.yml

@@ -1,6 +1,6 @@
 language: php
 
-php: [5.3]
+php: [5.3,5.4,5.5,5.6,7]
 
 env:
   - SF_VERSION='~2.3.0,>=2.3.18'