D7 port of actvitystream_facebook

Apparently FB are now limitting access to their resources and you need to get an App Id and App Secret to be able to get feeds. You need to sign up for free at https://developers.facebook.com/. This port is similar to facebook_pull but it's integrated with activity stream.

If you find it useful or have any suggestions please do respond.

Attached is my first take on the module upgrade.