Added day of week and year/month/day to digital. Fixed tilt.

Listens for Locale changes in order to update the date formatter
objects in the digital watchface.
Also fixed a sign in the tilt watchface that cause the minute
and hour hands to be left/right inverted.

Bug: 21299339
Bug: 21732906
Change-Id: I24980d7c2eb4d662059267575bbc9cbb073a6926