Facebook iOS SDK 3.12

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Facebook iOS SDK 3.13

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Facebook iOS SDK 3.13.1

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Merge commit '27fa392fce850c4b9de7099015a367847dd9125f' into HEAD

Conflicts:
	src/FBRequestConnection.h
	src/Network/FBRequestConnection.m
	src/Network/FBRequestMetadata.m
	src/Network/FBURLConnection.m