FindRadio.us - Station Call Letters Support

I added station call letters to findradio.us.

So you can look up a station using a link like:

WGCS
http://www.findradio.us/displayradio.php?gsCallsign=WGCS
I was previously using some IDs that were meaningless to do this. The IDs still work, but call letters are more user-friendly.

This makes it easier for other sites to link to my info.