merge with Streamtuner

Submitted by Sébastien Bacher @seb128

Link to original bug (#133116)

Description

This bug was originally reported in the Debian BTS: http://bugs.debian.org/223526

"Given how Streamtuner's only purpose is to be a frontend to Shoutcast's directory, it seems to me that it would be better to just integrate it into Rhythmbox, by creating a 3rd main category called Shoutcast (in addition to existing Library and Radio) that would be merged from Streamtuner's "yellow pages of mp3 streams"."

Version: 0.6.4