NHDPlus link update

- Link no longer a button

- Added off-site font-icon element
NHDPlus link update

- Link no longer its own text but instead hyperlinked around "Watershed Boundary Dataset"
Merge pull request #148 from isuftin/WATERSMART-413

Watersmart 413
Refactored plotting
- removed water budget plot
- removed singleton reference, should not be a singleton
- brought in latest version of flot
Merge pull request #149 from thongsav-usgs/WATERSMART-397

Refactored plotting