* Adding MediRouteButton, moving some values to resource for MR dialog and Mini Controller and some more...
 * Added support for MediaRouteButton
 * Added "alias" resources for Mini Controller play/pause/stop buttons so clients can customize them easily
 * Added a color resource to control thw color of the title of the custom VideoMediaRouteControllerDialog
 * Updated documentation
 * Fixed some typos in JavaDoc
Minor change
Making VideoCastControllerActivity's UI a tiny bit more general

Now, if needed, developers can define an ImageView for the background image instead of the previous
background that was used for the layout. To do so, copy the cast_activit.xml from res/layout
to your own res/layout and update that by:
- add an ImageView
- remove the android:id="@+id/pageView" from the RelativeLayout and put it on your ImageView.
The rest will just work.
Fixed a number of bugs to avoid NPE in various cases
Fixing a possible flickering of notification when switching between activities
Many bug fixes and changes, please see the changelist fro 1.4 -> 1.5
Fixing an issue where VideoCastControllerActivity would show loading progressbar
If user started castinga video but lock the screen before playback started and
after playback started unlock the device, the loading progressbar was staying on the
screen.
Fixing issue #58
merge from upstream