don't fall through switch case statement
add delete show menu item to ShowActivity

deletes the show and its episodes from the database, and finishes the
activity.
communicate episode selected from EpisodesListFragment to activity

By making container activity implement EpisodeSelectedListener.
Display new activity EpisodeActivity when an episode is selected

At the moment this activity does not contain anything, but sets its
title to the title of the episode. In the future this activity will
display details about the episode.
tvdb: parse correct xml tags for show ids

For the show records use "id" instead of "SeriesID", since "SeriesID"
actually refers to the show's id on tv.com. For the search results,
use id instead seriesid, even though they are the same value, to be
consistent.