Playlists playback support.

Here's my attempt at Playlists support. This adds a HomeScreen item for listing out configured playlists. You can select a play list and get a list of items to play. Right now I'm not filtering out the type of playlists. I'm also not happy with keeping the listview up to date when the playlist is playing. 

![roku_rarflix_playlists_home](https://cloud.githubusercontent.com/assets/884816/4086460/84d457e0-2f36-11e4-981e-0fb4f09a0a17.jpg)

![roku_rarflix_playlists](https://cloud.githubusercontent.com/assets/884816/4086462/89002e52-2f36-11e4-98ee-a60c031c41d3.jpg)

I'm new to Roku Plex/RARflix development and am sure this has problems. 

But, it works at my house on my Roku 2 XS with a QNAP (Intel) PMS 0.9.9.14.5 backend.