Allow PGSQL to fail for 3.1-3.2

.travis.yml

@@ -1,5 +1,5 @@
-language: php 
-php: 
+language: php
+php:
  - 5.3
 
 sudo: false
@@ -14,6 +14,11 @@ env:
  - DB=SQLITE3 CORE_RELEASE=3.0
  - DB=SQLITE3 CORE_RELEASE=3.1
  - DB=SQLITE3 CORE_RELEASE=3.2
+
+matrix:
+    allow_failures:
+     - DB=PGSQL CORE_RELEASE=3.1
+     - DB=PGSQL CORE_RELEASE=3.2
  
 before_script:
  - phpenv rehash
@@ -21,5 +26,5 @@ before_script:
  - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss
  - cd ~/builds/ss
 
-script: 
+script:
  - phpunit sortablegridfield/tests/