Add CakePHP 2.4.x to .travis.yml
Add `composer install` for PHPUnit
Remove CakePHP 2.1.x/2.2.x CI
Support PHP5.4 + CakePHP2.4.x (patch from kouchi@BSSZ)
Merge pull request #11 from fusic/cake24

Support PHP5.4 + CakePHP2.4.x (patch from kouchi@BSSZ)