Add elevation data + individual time-series exploration
Add elevation data + individual time-series exploration

1. Adds elevation data to the environmental data. Data is not dynamic since
   elevation is effectively unchanging at this time scale. It is also currently
   just point values at the starting coordinates for the route, i.e., no spatial
   averaging of any kind.

2. Adds notes on patterns and behavior of different forecasting approaches for a
   number of different individual time-series.

davharris/bbs-forecasting,davharris/bbs-forecasting,davharris/bbs-forecasting