Add test coverage for watcher rebuild message.
Description on how to use the tests
Merge pull request #422 from rjackson/test-watcher-build-change

Add test coverage for watcher rebuild message.
update version to be clear when using master
Reformatted testing section, added "Development Hints" heading
Fix link texts
Fix mocha link href
Remove broccoli-env dependency
add process to jshint globals
switch to using EMBER_ENV and remove now unused env param to EmberApp constructor