Test more php versions and 3.2 core

We haven't addressed this module for 3.2 compat yet but added more versions of php for 3.1 core.

.travis.yml

@@ -8,12 +8,18 @@ sudo: false
 
 env:
  - DB=MYSQL CORE_RELEASE=3.1
+ - DB=MYSQL CORE_RELEASE=3.2
  - DB=MYSQL CORE_RELEASE=3
 
 matrix:
   include:
     - php: 5.4
-      env: DB=MYSQL CORE_RELEASE=3
+      env: DB=MYSQL CORE_RELEASE=3.1
+    - php: 5.5
+      env: DB=MYSQL CORE_RELEASE=3.1
+    - php: 5.6
+      env: DB=MYSQL CORE_RELEASE=3.1
+      
 
 before_script:
  - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support