Merge pull request #3 from LukeSwart/toggle-layers

Toggle layers
Update project description details
Update WMS/WFS URI's to the new Geoserver instance
Enable bounding box feature
Cleanup code from bounding box, re-enable geocode bounding box
Remove extraneous attribution
Bounding box and zoom adjustments
Edit layer and legend

 - WMS layers now read opacity, and NLCD layer has 0.4 opacity

 - Buildings layer is switched with landuse layer on legend and in
   rendering precedence

 - Fixed a comment
Revert WFS to static file for ROI layer (CORS conflicts on new Docker Geoserver)
Implement expandable layer-toggling legend via Leaflet.js
Remove remaining code related to Argo's legend