These changes make the role field required in the User model. Changes to
the Admin user edit view were added to provide validation for the role
field.
As an added enhancement, the user's roles are displayed in the Admin
user list view.
Two different strategies are adopted, one for when the user authenticates locally and the other through providers. When authenticating locally, the signin function in the client controller redirects to the previous state (storing and using a state name) after successful login. When authenticating through a provider, the first call to provider stores the previous URL (not state, URL) in the session. Then, when provider actually calls the authentication callback, session redirect_to path is used for redirecting user.
A state parameter was added for the routes that require user authentication. Now, everytime a statechange occurs, the destination state is checked and user is redirected to signin page if necessary. Note the state parameter is added within `data`, so that nested states can inherent its value.
Emails are made unique. When user attempts to sign in through a provider in which his email is one that is already registered, user is redirected to the signin page with an error passed as a query string parameter.
The executable bit is set for a lot of files where it is not necessary
to have the executable bit set. This PR removes the executable bit from
those files.
