fix typo
simplify the users flow

Reeled back in some of the stuff I did yesterday.  Collapsed the
users#edit back down into a single action rather than having the
users#profile, users#settings, etc. actions that I had setup yesterday.
 We just don’t need them right now.

Added the ‘computer preference’ field to the User model and a
‘Preferences’ section to the edit form.  Also created a separate form
section for “Roles and Permissions” to split that out a bit.