Show count of contacts in account and group view

* Change contact list item height from 64dp to 56dp per b/29831679.
* Move name view in contact list item up by 2dp, per UX.
* Change the top padding to 8dp per b/29831679.

* Show the header in: account view, group member view and group member
  picker view.
* Set top padding for list view only when there's no account header.
* Change action bar title to "From <account>" in account view.
* Override onScrollListener to hide and show header divider.

Bug 29190106
Bug 29831679

Change-Id: I36a2083c91b6b052bf887a8e7c639085d2bf4691