heroku deploy
test fix for chart toggle bug
fix chart display bug by adding separate containers

there had been one container for the 2 temp charts
and one container for the 2 precip charts

there was also a bug where data was not being appropriately
cleared when toggling between the charts, resulting in
inches/millimeter data flashing back and forth as you mouseover
parts of the graph

this is now fixed by having separate <canvas> elements for all 4 charts
and toggling hide/show as appropriate
changed colors on graphs
delete key