Add owner concern
Add ownership tests and specs
Add explicit test for another owner type object
Restore accidentally delete attr_accessible declaration in user
update class diagram for wiki docs
Merge pull request #51 from camallen/update_class_diagram

update class diagram for wiki docs
add user personal info scrubber to be used when disabling a user
scrub personal user info on users_controller destroy action
use the Activation class to disable all instances
Do not hash their login name when scrubbing personal info

Just leave the login as is since it's not personal information thus avoiding probelms with duplicate login names on revert and uniq index clashes when hashing.
remove the zlib require
cascade disable to linked projects and memberships when destroying a user group