Sf project callback after approval

When a project is approved in SalesForce, as per #100 this needs to automatically tell Rails to sync the newest project details so the now-approved project will appear on the Rails homepage.

In order to accomplish this a new "status" field on Project is required, with two simple statuses for now:

needs review
approved
When any project is set to "approved" the automated sync should occur.

https://trello.com/c/hgb1doyd/130-sf-to-rails-callback-after-approval