Support for roles in Houston

[RavDanny]

2 issues regarding roles and more in Houston:

1. When trying include the Roles collection (created by alanning:roles) in the admin ui using Houston.add_collection(Roles);, my app crashes with:
   TypeError: collection.find is not a function
   I don't get any error with Houston.add_collection(Meteor.users) or Houston.add_collection(Houston._admins)
2. There are a few features that would be very desirable from an admin package:
   a. Role configuration and management (as offered in Django, for example)
   b. Being able to change passwords
   c. Configuration of collection views (i.e. which fields are displayed)
   Are any of these features being contemplated?