1. In README, changed github clone transport from https to ssh
2. Added MONGO_URI to sample.env and noted in README that it’s required
3. Added note about needing mongod running to run app maker in README
4. Brief read me note about Procfile and foreman
Merge branch 'rorito' of github.com:rorito/appmaker into develop

Conflicts:
	README.md
Merge branch 'develop' of github.com:mozilla-appmaker/appmaker into develop