cleanup auth in app.core: delete unused methods and logic in AuthCtrl and IdentityService (AuthCtrl now provides access to IdentityService on scope), add ngDialog for signup, add media object with google profile image to AuthWidget (should be refactored and abstracted as a chip directive and obviously needs to be able to get profile images other than those from google since we have multiple providers, but this should be most likely be handled on the back end with a profileImage url)