Add the ubuntugis ppa in puppet

Add the ubuntugis ppa in puppet so the latest versions of gdal-bin and python-gdal are pulled in.

Also miscellaneous other changes:
* make puppet install shapely with pip
* move the python scripts into bin/
* add .gitignore
* remove main.css (not sure why this was there, if this is needed let me know and I'll put it back)
* add data/ for loading data into, and data/.gitignore
* fix tabs in precise.pp