removed unused imports in stage_data.py
Merge remote-tracking branch 'master_repo/master'
updates to dygraph javascript and implemented headers in data downloads
Merge remote-tracking branch 'master_repo/master'

Conflicts:
	dj_eden_app/views/data_views.py
updated license and removed dygraph-extra (wasn't being used)
LICENSE.md update
Merge pull request #14 from ayan-usgs/master

first cut of data download headers and update license