Mms: Use a card-based UI

Before: http://imgur.com/7DpIenj
After:  http://imgur.com/H8FmJjN

PS9:
- Remove top and bottom padding in converation list
PS12:
- Add padding again but it will scroll now.

Change-Id: I798502ba1a19f8dcb271627ba3af83922ace2cf8

Conflicts:

	res/drawable-hdpi/list_activated_holo.9.png
	res/drawable-hdpi/list_focused_holo.9.png
	res/drawable-hdpi/list_selected_holo.9.png
	res/drawable-hdpi/list_selected_holo_light.9.png
	res/drawable-mdpi/list_activated_holo.9.png
	res/drawable-mdpi/list_focused_holo.9.png
	res/drawable-mdpi/list_selected_holo.9.png
	res/drawable-mdpi/list_selected_holo_light.9.png
	res/drawable-xhdpi/list_activated_holo.9.png
	res/drawable-xhdpi/list_focused_holo.9.png
	res/drawable-xhdpi/list_selected_holo.9.png
	res/drawable-xhdpi/list_selected_holo_light.9.png
	res/drawable-xxhdpi/list_selected_holo_light.9.png
	res/layout/conversation_list_screen.xml