created cso-history route and sqlalchemy stuff to connect to cso-data.db
updated cso api endpoint to show number of minutes of overflow per river section, added arcgis_layers json extract
river-viewer
right projection.. i think
explain provenance and transformations of data
Update README.md
credit esri_to_geo
explain how to get data file from arcgis site
csv
lats and longs in csv
extract layers
Merge branch 'cso-charting'