Try different travis setup

.travis.yml

@@ -1,13 +1,16 @@
 language: php
 
 php:
+  - 5.3
   - 5.4
   - 5.5
+  - 5.6
 
 before_script:
   - pear upgrade PEAR
   - pear config-set auto_discover 1
-  - pear install phpunit/PHPUnit-3.7.32
+  - pear channel-discover pear.phpunit.de
+  - pear install --alldeps pear.phpunit.de/PHPUnit-3.7.31
   - mysql -e 'CREATE DATABASE cakephp_test;'
   - echo -e "Host github.com\n\tStrictHostKeyChecking no\n" >> ~/.ssh/config
   - git clone --depth 2 https://github.com/cakephp/cakephp.git