Add graph downloading and log axis options
Fix indent in demo, remove discs in list
Every function public, more plot helpers, some fixes

Make all functions public for the time being
Fix wrong name for sort_timestamps function
Rename download_graph to use underscores
Add function to get multiple csv asyncronously
Add option for year/month/day for the api_station_info
Add function to prepare x, y data arrays for plotting (zip)
Add function similar to numpy.interp
Add a function to combine various flot options (FIXME, does not work
yet)