Update Vagrantfile for Salt deployment

* Add salt provider
* Track develop branch of salt for bootstrap. This addresses an issue with
  postgres_user present in 0.17. Pinning the next stable release should be
  adequate
* Bump up memory
* Change web port to match nginx config
* Add better dns resolver, maybe not required
Migrate Chef config to Salt, improve site deploy

* Migrated most services 1-to-1
* Updated package install to work with pip 1.5+
* Updated application setup to perform actions on database as well
* Added temporary local_settings to get the server running
Add hiredis requirement