Remove php 5.3 and 5.4 from testing

Author: tedivm

.travis.yml

@@ -1,8 +1,6 @@
 language: php
 
 php:
-    - 5.3
-    - 5.4
     - 5.5
     - 5.6
     - hhvm
@@ -21,4 +19,4 @@ matrix:
     fast_finish: true
     allow_failures:
       - php: hhvm
-      - php: hhvm-nightly
+      - php: hhvm-nightly