Using grey for average.
Merge branch 'master' into NAWQAAN-122

Conflicts:
	nar_ui/views.py
Switched order of average and current year bars. Accounted for different year ranges.
Making units metric
Checkpointing attempts to group graphs by unit label.
Merge branch 'master' into NAWQAAN-122
Tweaks.
Merge pull request #35 from cschroed-usgs/NAWQAAN-122

Nawqaan 122
Moving unit label
Removing red.
Shrinking map height, changing default base map
Adding NLCD maps
Linking visibility.
Refactored, introducing descriptive helper methods.
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Merge branch 'master' into NAWQAAN-122
Switching gages layer to triangles style.
Merge pull request #37 from cschroed-usgs/NAWQAAN-133

Nawqaan 133
Added ability to override default legend placement. Moved legend below units.
Merge pull request #36 from cschroed-usgs/NAWQAAN-122

Moving unit label