Async callback option for authentication methods
Updating async auth comments
Make helper method private
renamed callbacks
Add asynchronous authentication method tests
More async auth check tests. Return username as callback parameter for isLoggedOut
Callback builder method
cleanup comments
Refactor callbacks
Refactor callbacks
Refactor async auth callbacks
Update docs
Moved test methods from sdk into specs. Fixed bug with old synchronous methods
Change oncomplete back to success callback for getLoggedInUser
* since oncomplete doesn't have params
Add session expiry modifier
Update change log
Merge branch '0.7.0-wip' into async-auth

Conflicts:
	stackmob.js
	test/spec/LoginSpec.js
Run tests against deployed API
Merge branch '0.7.0-wip' into async-auth

Conflicts:
	CHANGELOG.md
Helper method for detecting callback methods