Cakephp Support

- Supports pear-based installation of CakePHP for autodetection - we don't currently have it in packagist because of reasons
- Uses the url rewriting configuration from [here](http://book.cakephp.org/2.0/en/installation/url-rewriting.html#pretty-urls-on-nginx)
- Added some docs on slim and stuff

Works here:

- http://cakephp-test.herokuapp.com/
- http://cakephp-test.herokuapp.com/pages/gnome

Seems legit? Refs FriendsOfCake/app-template#22