show episode title and number at top of details

show episode title in bold at top of details fragment. and combine with
the season and episode numbers, e.g. "01x01 - First Episode".
put show name and season num in season action bar

make show name the title and season number (or "specials") the subtitle.
set activity titles to empty string initially

for activities which load their title at run time, set the title to an
empty string in the manifest. for the brief time before the correct
title has loaded it's better to show nothing than the default title
"Episodes". (it looks a bit rubbish showing "Episodes" for a split
second then changing it.)
bump targetSdkVersion to 19

kitkat's been out for ages
set build target to android-19
change shows table's name column type to text

from varchar. android sqlite doesn't actually use varchar and
automatically makes them text instead. so this doesn't actually change
the database at all, just makes the code more accurate.