Add onLongClick action to notication clock and date

- As discussed with ciwrl on google+, LongClick opens DateTimeSettings
- Moved on-touch color change to superior xml solution, as suggested by
  Andrew Boren <preludedrew@gmail.com> here: http://review.evervolv.com/#/c/3676/"

Change-Id: I1fae71e347ffcb786227ba0b2651a66f2df35e27