Update travis test coverage

.travis.yml

@@ -1,20 +1,33 @@
-language: php
+# See https://github.com/silverstripe-labs/silverstripe-travis-support for setup details
 
 sudo: false
 
+language: php
+
 php:
   - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
 
 env:
-  matrix:
-    - DB=POSTGRESQL CORE_RELEASE=master
+  - DB=SQLITE CORE_RELEASE=3.2
+
+matrix:
+  include:
+    - php: 5.6
+      env: CORE_RELEASE=3
+    - php: 5.6
+      env: CORE_RELEASE=3 PDO=1
+    - php: 5.6
+      env: CORE_RELEASE=3.3
 
 before_script:
- - composer self-update || true
- - phpenv rehash
- - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support
- - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss
- - cd ~/builds/ss
+  - composer self-update || true
+  - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support
+  - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss
+  - cd ~/builds/ss
+  - composer install
 
-script: 
- - phpunit framework/tests 
+script:
+  - vendor/bin/phpunit framework/tests