Changed base layer IDs.
Updated to correspond with new map service.
Update layers.xml
Update layers.xml
Reconciled pull request.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	layers.xml
Reconciled merge conflicts.

(DVA)
Merge pull request #16 from Georgia-Tech-Center-for-GIS/GretaYi-master

Reconciled merge conflicts.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	layers.xml
Tweaking URL in checked/unchecked images.
Made entire layer item clickable.
Fixes to layers, clickable layer list exception

Tweaks to layers.xml, minor fixes to layer list.
Merge pull request #17 from DVAlhadeff/master

Reconciliation and minor fixes to layers.xml/layer list