Facebook iOS SDK 3.8

Summary:
     see https://developers.facebook.com/ios/change-log-3.x/

    Upgrading from 3.7
     https://developers.facebook.com/docs/ios/upgrading-from-3.7-to-3.8/

Reviewed By: chrisp

Test Plan: Release Testing.
Update project file deployment target to iOS 7 for 64-bit builds.

Reviewed By: chrisp

Test Plan: Built via XCode 5.
Merge remote-tracking branch 'upstream/master'