Merge pull request #7 from pablorusso/new_icons

New icons and art background during play
Resize all icons to 128x128
Added discover functionality to spotify API
Added discovery functionality to Plex plugin
Radio implemented in spotify API
Radio implemented at plex plugin
Merge pull request #8 from pablorusso/discover

Discover
Merge pull request #9 from pablorusso/radio

Radio
Custom radio in spotify api
Custom radio in plex plugin
Ping pong is resolved interacting with a locally hosted flash using phantomJS