Navigation adjustment for updated design guidelines and QuickContact cards

Bug 6362611

Change QuickContactActivity to task affinity "" to keep it from starting
orphaned/confused tasks.

Launch ContactDetailActivity in the same task from QuickContactActivity.

Launch app-supplied intents from QuickContactActivity in the same task.

Clear the QuickContactActivity task when launching it from a launcher
shortcut or widget. This prevents activities launched from the
finished QuickContactActivity from hanging around as the root and
failing to be reset.

Remove app-specific Up navigation code from ContactDetailActivity and
let the JB framework handle it automatically.

Change-Id: I4abebcb135b2d3269039b3307a49115c13528295