Making the auth hash schema provide the required [info][name] field

According to https://github.com/intridea/omniauth/wiki/Auth-Hash-Schema the schema of the auth hash should include ["info"]["name"]. I just used the display_name, since it seemed to fit the description.

> `name` (required) - The best display name known to the strategy. Usually a concatenation of first and last name, but may also be an arbitrary designator or nickname for some strategies