Prepared project and submodules for iOS port
Made it compile for iOS
Untested implementation of download
Updated CurlHandle
Updated CurlHandle
Updated CurlHandle
Merge branch 'curlhandle-4' into for-iOS

Conflicts:
	.gitmodules
	ConnectionKit/CK2CURLBasedProtocol.m
	ConnectionKit/CK2FileManager.m
	ConnectionKit/CK2Protocol.h
	CurlHandle
Added copy headers build phase to iOS target.
Set public header folder for iOS target.
Merge remote-tracking branch 'origin/for-iOS'

Conflicts:
	ConnectionKit/CK2CURLBasedProtocol.m
	ConnectionKit/CK2FileManager.m
	ConnectionKit/CKConnectionProtocol.h
	ConnectionKit/CKTransferRecord.h
	ConnectionKit/Connection.h
	ConnectionKit/Connection_Prefix.pch
	ConnectionKit/NSData+Connection.h
	ConnectionKit/NSData+Connection.m
	ConnectionKit/RunLoopForwarder.h
	CurlHandle
	DAVKit
	UKQueue/UKFileWatcher.m
	UKQueue/UKMainThreadProxy.h