Fix .travis.yml
Install PHPUnit at correct place to load from CakePHP
Add feature to use POST request method on using find().
- Some of twitter apis encourages to use POST method for larger requests.
- See https://dev.twitter.com/docs/api/1.1/get/users/lookup for example.
Fix test of Oauth controller
- If custom routes uses database it failed that resetting routes can workaround.
- Auth->loginAction could not override when Auth component was configured at some callback such as beforeFilter.