Merge pull request #3468 from h4cc/patch-1

Added PHP 5.6 to travis.

.travis.yml

@@ -5,6 +5,7 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - 5.6
 
 env:
   - DB=mysql
@@ -12,6 +13,8 @@ env:
   - DB=sqlite
 
 matrix:
+  allow_failures:
+    - php: 5.6
   include:
     - php: 5.4
       env: