Get rid of roles

app/models/event.rb

app/models/project.rb

app/models/user.rb

app/roles/account.rb

app/roles/authority.rb

app/roles/namespaced_project.rb

app/roles/note_event.rb

app/roles/push_event.rb

app/roles/push_observer.rb

app/roles/repository.rb

app/roles/team.rb

lib/git_host.rb

lib/issue_commonality.rb

lib/static_model.rb

lib/votes.rb

spec/lib/issue_commonality_spec.rb

spec/lib/votes_spec.rb

spec/models/project_repository_spec.rb

spec/models/user_spec.rb

spec/roles/account_role_spec.rb