[frontend] Updating deps

    - ember
    - ember data
    - ember data drf adapter
    - bootstrap
[frontend] removed search controller

    - to simplify things for now, we will implement
      after basic functionality is done
[frontend] Fixed teams not being added when creating a user
[frontend] Fixed missing 'cancel' action
[frontend] Tidying up add/edit user form
TODO list++
[frontend] Preventing dirty user model on route exit