NSLinkList

NSLinkList and testcase
Merge branch 'master' of https://github.com/wshcdr/pointlist

Conflicts:

NSLinkList/NSLinkList.xcodeproj/project.xcworkspace/xcuserdata/apple.xcu
serdatad/UserInterfaceState.xcuserstate
	NSLinkList/NSLinkList/AppDelegate.h
	NSLinkList/NSLinkList/AppDelegate.m
	NSLinkList/NSLinkList/CGPointEx.h
	NSLinkList/NSLinkList/CGPointEx.m
	NSLinkList/NSLinkList/LPtNode.h
	NSLinkList/NSLinkList/LPtNode.m
	NSLinkList/NSLinkList/NSPointsList.h
	NSLinkList/NSLinkList/NSPointsList.m
	NSLinkList/NSLinkList/ViewController.h
	NSLinkList/NSLinkList/ViewController.m
	NSLinkList/NSLinkList/main.m