Lyrics

I've added a lyrics functionality. Basically it will search for lyrics in the file metadata (with the open source library jaudiotagger), and if it's not found it will search for them in the Internet (currently from one source). If so, it gives the possibility to save the lyrics in metadata in order to be shown with the first method next time.

The lyrics are shown in the audio player it tapped on the album image. I've always wanted this functionality, but only found it in the MIUI's player.

I'm planning on improving the system, but I would like to know if the modification is welcomed or I should work separately.

Here is a screenshot: https://plus.google.com/109061484468633397346/posts/4iFVEri7zjn