Merge pull request #85 from isuftin/master

Vertex, overwriting, baseline naming, UI tabbing
Merge pull request #86 from isuftin/master

Baseline overwrite
Moved all javascript to bottom of page in order to have DOM load faster
Added check for layer so it doesn't get clobbered.  For now just throw an exception if layer exists.
Merge pull request #87 from jiwalker-usgs/master

checking if layer exists first
Merge remote-tracking branch 'upstream/master' into workspace-per-session
Merge remote-tracking branch 'upstream/master'
Merge branch 'workspace-per-session'
Code cleanup