Add RestStop2 functionality (except auth methods)

- router.coffee:
  - Add Restfully.configure() for one-time api configuration
  - Add Restfully.add() for adding ReSTful routes to the API
    - Use Iron Router's server-side routing instead of implementing our
      own router (per RestStop2's suggestion)
- auth.coffee:
  - Add functions for validating a user identifier object, generating a
    MongoDB selector, and logging a Meteor.user in with their id and
    password on the server (generate and store an auth token)
  - Add a method stub for Restfully.initAuth() to initialize login and
    logout api methods
- package.coffee:
  - Lower min meteor version to 0.9.0
  - Export Restfully object
  - Update to be more coffeescripty (remove lots of unnecessary
    parentheses)
  - Add dependency on 'check' library