Added support for age range.

[mhverbakel]

trafficstars

Fixes #217.

[coveralls]

Coverage remained the same at 100.0% when pulling b9da85ff1bd2dc0e49280527ffa8a40757029b22 on mhverbakel:master into 90a642b4738367f929fc2df05a1c3203cd7df38f on jaredhanson:master.

[rwky]

Merged in https://github.com/passport-next/passport-facebook

[jaredhanson]

Passport tries to keep profiles normalized to the Portable Contacts schema, or extensions to it such as OpenSocial. The simplifies integration of multiple social providers, by avoiding things that may be specific to an IdP like Facebook.

IdP-specific attributes are always available via profile._json. I'd consider merging this if there were a clear convention around age range support across IdPs.