Reworked ListingSource and DummyListingSource.
Added basis for ChannelGuide activity and a button to start it
from the main activity.

NOTE: I do not know what the following files are or where they
came from:
	res/values/dimens.xml
	res/values-sw720dp-land/dimens.xml
	res/values-sw600dp/dimens.xml
	res/menu/channel_guide.xml
	libs/android-support-v4.jar