Remove the ActionBar overlay in the EpisodeDetailsActivity.

A couple of things had me do this:

1) The ActionBar items, when using the "light" theme, are difficult to notice with the overlay.
2) I think it looks much nicer, especially with the new PagerSlidingTabStrip library.

I tried looking for a reason to keep the overlay, but didn't notice anything explicit. Did you have one in particular or was it just for aesthetics?