Several color ranges to choose from.
Add min, max columns for daily query.
Station-based daily and hourly multi-gage queries.
To be done: NAVD88 correction, column splitting by flag.
Test for station_data.
Exposes an error! yay!
More tests for station_data.
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)