initial users implementation

- added user model
- added dev and test only function to clear database
- added exposed api endpoint to get all users
- added api endpoint to create a user
- added corresponding tests and test tools
- updated readme with dev guide
added test for duplicate users
added basic auth
added locations schema
renamed directories

routes -> controllers
tests  -> test
and fixed require in app.coffee
Merge pull request #2 from 25cf/master

Added Locations and Users models, routes, and tests