Version 0.5

* Change test framework to Mocha
   - Add testem/mocha shim to work with require
   - Move test config to reside under test/
* Remove 'DOMContentLoaded' replacement
   - Replaced by custom 'DOMScriptsLoaded' event
* Simplify Script.current() to be universal between browsers
   - Requeue any 'body' scripts during 'DOMContentLoaded' instead
   - Remove old Loader.ready