Add Call statistics to Contacts (Phone)

Available from the local menu in the Phone application (except from
the Dialer Fragment).

Call-type filter can be selected in the actionbar.
If all call types are selected the incoming/outgoing rates show up in
blue/green respectively.
Tapping on an item starts a new activity that shows all call types with
details for the given contact or number.

Sample screenshots: http://files.sethyx.info/aokp/call_stats_sample.png

Draft to avoid early kangers.

PS2: Fix whitespaces.
PS3: Added optional date-range filter and some comments.
PS4: Whitespaces & small layout fixes.
PS5: Changed date filter dialog behavior (1 action icon, 2 dialog buttons).
PS6: OCD
PS7: Slightly amended filter icon & more code OCD.
PS8: Merge items with "equal" (national/international) phone numbers

Change-Id: I94cd49e167b82bc7eaeab9225ed96a273a33b18c
Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>

Conflicts:
	res/values/strings.xml