bugfix
requiring mixins before classes as some classes may require mixins
extracted out logic to UserFormView

UserFormView should ideally go inside views/users, but in that case, it
will be loaded after MeEdit, which requires it
added partial users/show
bugfix
`self` is not used anymore
added partial users/form
added property `isCurrentUser` to UserMixin (used in templates to show a label saying 'that's you')
bugfixes
added UserFormView to support users/edit