Restored the CLONES track to the Location image on Gene pages.

This pull request adds a new track to the location image on Gene pages.  The track is called "YACs, Fosmids, and Cosmids".

Once pulled -- and if you have gbrowse installed -- you should see this track on gene pages like:

http://staging.wormbase.org/species/c_elegans/gene/WBGene00006466#0h-9e-10