Enhancements

* sub directories search (thanks to @ngirot)
* force the use of the `test` subcommand of casperjs for includes, pre and post to work (and because this plugin is aimed to run tests)
* Stick a maximum to the way m-surefire-p works : only execute test files that match given patterns (by default `**/*Test.js, **/Test*.js, **/*TestSuite.js, **/*Test.coffee, **/Test*.coffee, **/*TestSuite.coffee`). Can also execute only a specific file
* Find which files to includes by patterns also, or use raw includes parameter