Update tests with administrator account

These tests now ensure that the proper privileges are observed when
creating/updating accounts so that only the right values can be
changed by the proper users in the usual and desired ways.  Most
functionality with the user login/logout/creation should be complete
at this point.
Merge https://github.com/geisler/game_contest_server into dev

Conflicts:
	spec/features/users_pages_spec.rb
Passing most tests