Regex path match improvements

The second commit allows velocity test runner packages to use a file structure like mocha-web does by using the regular expression `"mocha-web/(client|server)/.+\\.(js|coffee)$"`:
* mocha-web
  * client
    * mySpec1.js
    * mySpec2.js
  * server
    * mySpec1.js
    * mySpec2.js

Matching just by file name is still supported: `-jasmine-unit\\.(js|coffee)$`.