Fix deprecations introduced in ember 1.11 at user/edit

[holandes22]

http://emberjs.com/deprecations/v1.x/

• [x] Remove proxy behavior (use model.attr instead of attr directly). Needs adding explicit controller in add/edit route
• [ ] Replace selectionBinding with selection in select view of edit/add template

[holandes22]

Consider replacing select with https://github.com/thefrontside/emberx-select