Fixed various issues around cross-fades

* Fixes the layout in portrait tablet
* Introduces the same cross-fade when going from group to group
* Reduces memory consumption by creating the transition-bitmap on demand
  (takes 40ms on Xoom)
* Simplifies the layout files by removing some configuration options
  that we aren't using anyway
* Split the detail views for contact and groups, so that the animation
  of one doesn't affect the other

Bug:6117161

Change-Id: I2509c9387de6b1ac60dbc9b694564291910bde72