Calendar rebase

This replaces #1281.

Fixed unit tests and cleaner history based on Scott's rebase. Unit tests work in latest FF and Chrome but still fail via grunt. @jzaefferer You mentioned an upcoming improvement for asycTests?
> Maybe there should be one test that verifies all of the pass-through options in datepicker's API make it to calendar? 

Just checking if the value is passed correctly into _setOption method?