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/
Facebook iOS SDK 3.14

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Facebook iOS SDK 3.14.1

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Facebook iOS SDK 3.15

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Facebook iOS SDK 3.15.1

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

Upgrading:
    https://developers.facebook.com/docs/ios/upgrading/
Merge remote-tracking branch 'upstream/master'

Conflicts:
	samples/Configurations/Project.xcconfig
	samples/HelloFacebookSample/HelloFacebookSample/HFViewController.m
	samples/Scrumptious/scrumptious/SCViewController.m
	scripts/productbuild_distribution.xml
	src/Core/FBDataDiskCache.m
	src/Core/FBError.m
	src/DeviceAPI/FBAppBridgeScheme.h
	src/DeviceAPI/FBAppBridgeScheme.m
	src/DeviceAPI/FBDialogs.m
	src/DeviceAPI/FBLinkShareParams.m
	src/FBDialogs.h
	src/FBError.h
	src/FBSessionLoginStrategy.h
	src/FBShareDialogParams.h
	src/FBShareDialogPhotoParams.h
	src/FacebookSDK.h
	src/Insights/FBAppEvents+Internal.h
	src/Insights/FBAppEvents.m
	src/Login/FBSession.m
	src/Login/FBTestSession.m
	src/Network/FBGraphObject.m
	src/Network/FBRequestConnection.m
	src/UI/FBProfilePictureView.m
	src/facebook-ios-sdk.xcodeproj/project.pbxproj