This update includes the following:
 - Check in the source CSV and SHP data files used in this package. All the files used have been detailed in README.md along with any modifications. All this data being checked in is originally licensed under Creative Commons BY 3.0, permitting redistribution and re-mixing.
 - Remove the 2008 Tree Canopy layer, it doesn't offer much in terms of data.
 - Add gitignore file