NAWQAAN-289

* Added function for basins to mapCommons
* Added basins as overlay on map
* Minor cleanup
Merge branch 'master' of github.com:USGS-CIDA/nar_ui into NAWQAAN-289

Conflicts:
	nar_common/static/nar_ui/mississippi/map.js
NAWQAAN-289

* Moved basin layer creation to better place
Merge pull request #198 from jiwalker-usgs/NAWQAAN-289

NAWQAAN-289