remove user from repository
remove user from repository

- user is not tied to the database model
  Actually users are tied to a repository
  through permissions.
- Furthermore it should be revisited if
  the attr_accessor are really necessary.

ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub