- codes for conserving user's liquidsoap.cfg and porting into new stream
setting config.
- extra fix: fixed a bug with shoutcast(default value has to be set for
some variables)
interface
- dummy page "Stream Setting" page for the test
- StreamSetting model is added
- set owner and group as 'pypo' for liquidsoap.cfg
- pypofech handle 'update_stream_setting' command