Add documentation for enyo.ready and provide guarantee that all callbacks are async by using enyo.asyncMethod.
Add tests for enyo.ready by modifying test runner to use it to start things.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #351 from enyojs/ready-async-and-docs

Add documentation for enyo.ready and provide guarantee that all callback...