Added download/delete menus to podcasts episodes, podcast refresh button
Added server version checks to new podcast methods
Fix podcasts not being invalidated when switching servers
Convert all fragments over to displaying nothing while refreshing/in error
Draw genre button like a spinner
Merge remote-tracking branch 'upstream/master' into hedwig34
      Resolved conflicts
Conflicts:
	subsonic-android/src/com/hedwig34/dsub/fragments/SelectPodcastsFragment.java