[PR] Improvements in provisioning and organization to mirror WSU Web Provisioner changes

* [x] Setup pillar data for nginx site configurations
* [x] Move to git develop branch for Salt to solve our MySQL troubles temporarily. This causes some issues on production that we'll need to work around as git is currently blocked.
* [x] Refresh README with current pillar loayout
* [x] Use `/tmp` as the initial storage directory before copying salt configs over.