Move label generation to Plottable class.
Merge pull request #40 from ayan-usgs/master

different header constructed for multi-parameter downloads.
Merge remote-tracking branch 'upstream/master'
Add REST-style URLs for param plot images.
Fixes from working with Bryan to get his local server running.
Merge pull request #41 from rhayes-cida/master

Changes to make site work on Bryan's workstation