basic notifier model and specs added
fresh ideas
cancan added; customs used on lockprocess of user
resources are disabled when user locks its account
removed pingform from group
user_spec: password presence only on create
cancan: only visible items should be shown
cancan: items shown
cancan auth for user deactivated
basic group specs added
revised groupings migration; participations of groups can be accepted
items slug migration removed on self.down
texting of participate-button of a group
refractoing of group.users to group.members
Group owner invite users and others can participate on groups
texting of group form; more group specs added
partial for images on groups and items
request specs for editing groups
group-/ userspecs
observer moded into seperated folder