Merge pull request #1 from jsatt/master

add python and postgresql setup
Merge pull request #2 from jsatt/master

enable nginx, redis and setup gis db
Merge pull request #3 from jsatt/master

fix format healthgeist_db yaml
Merge pull request #4 from jsatt/master

fix typo in db setup
switch bootstrap script to specify salt version
update readme for new bootstrap script
Merge pull request #5 from jsatt/switch_bootstrap

Switch bootstrap
do more postgres setup, add settings_override.py