Fix PHP 5.2 and 5.3 fails

Author: JoryHogeveen

.travis.yml

@@ -37,11 +37,13 @@ matrix:
       env: WP_VERSION=latest WP_MULTISITE=0
     - php: 5.3
       env: WP_VERSION=3.7 WP_MULTISITE=0
+      dist: precise
     - php: 5.2
       env: WP_VERSION=latest WP_MULTISITE=0
+      dist: precise
     - php: 5.2
       env: WP_VERSION=3.7 WP_MULTISITE=0
-
+      dist: precise
 
 ## Cache composer bits
 cache:
@@ -71,4 +73,4 @@ script:
     else
       phpunit;
     fi
-#  - cd tests/spec && bundle exec rspec test.rb
+#  - cd tests/spec && bundle exec rspec test.rb