Merge pull request #79 from adamwathan/allow-overriding-user

Allow overriding user by returning a user from the callback

Merge pull request #78 from colindecarlo/socialnorm-0.1-to-0.2

Socialnorm 0.1 to 0.2

Put IdentityStore behind interface

To allow end user to swap

Expose registerProvider method through OAuthManager

Doc aesthetics

Merge pull request #64 from mul14/use-databasepath

Use databasePath() so we can use in Lumen

Update Facebook Provider for Graph API 2.0

Merge pull request #56 from Metrakit/laravel-4

Fix bug with the Facebook provider

More Facebook Graph API 2.0 updates

Throw exception if user not found

If somehow the user that matches the identity has been deleted, throw
an exception instead of returning a null user.

Resolves #49.