updated Ember to latest release
Update Users API to handle role objects or ids

Closes #3357
- API method User#edit now handles User objects that have either
  an array of Role ids or objects.
- Fixed error handler notification on upload modal controller.
Merge pull request #3360 from jaswilli/issue-3357

Update Users API to handle role objects or ids
Merge pull request #3361 from simplabs/update-ember

Updated Ember to 1.6.1
Upgrading Casper to potential 1.0 version