Bug [#46218623] Can't archive a user

Fixes to memberships_controller and membership view code to make sure
we're transmitting what's needed to update the user/membership
association.
Merge branch 'master' into cant_archive_users

Conflicts:
	app/assets/javascripts/models/membership.js.coffee
Merge pull request #95 from rescuedcode/cant_archive_users

Bug [#46218623] Can't archive a user