feat(user-management): use the User $resource to populate users for the admin page

[kingcody]

Changes:

• use User.query() in admin.controller instead of $http

[kingcody]

@DaftMonk I noticed you mentioned the use of the canary branch for 'larger' features. Should PR's be made to that branch currently or did you want to wait till a particular time?

[meeDamian]

Great point!

It should work the same even if you remove your changes to user.service.{js,coffee} files, and use $scope.users = User.get() instead :).

I think master is suitable for that change.

[kingcody]

@chester1000, you're partly correct? The endpoint /api/user returns an array. Wouldn't the User.get() method be configured to have isArray: true? I'm pretty sure angular errors when it is not set. However other endpoints such as /api/user/me return {} so the .get() method works for those.
Please correct me if I'm wrong. Thanks

[meeDamian]

Oups, I meant query.

[...] Use $scope.users = User.query() instead :).

[kingcody]

ah, indeed. I shall revise.

[kingcody]

@chester1000 thanks. Silly me too, I definitely knew $resource.query(). Duh ;)