Add content mode spinner, remove main menu options

Conflicts:
	res/menu/content_modes.xml
	src/net/alliknow/podcatcher/EpisodeListActivity.java
	src/net/alliknow/podcatcher/ShowEpisodeListActivity.java
	src/net/alliknow/podcatcher/view/fragments/PodcastListFragment.java
	src/net/alliknow/podcatcher/view/fragments/PodcatcherListFragment.java
Refine new content spinner for big screens

Conflicts:
	src/net/alliknow/podcatcher/ShowEpisodeListActivity.java