Added option to allow time to be changed without impacting date

Added noAdvanceDate option that allows hour/minute/second selectors to "spin" freely without incrementing/decrementing the parent unit (i.e., the date will not change when the time is adjusted past midnight).

This allows the widget to behave similarly to the time selectors in the iPhone calendar and reminders apps.

Enabled by adding {noAdvanceDate:true} when initializing.