add using method introduction
Objc -> Swfit
Objc -> Swfit
New Commit
Merge branch 'master' of https://github.com/HunkSmile/Swift

Conflicts:
	TSwfit/TSwfit.xcodeproj/project.pbxproj
	TSwfit/TSwfit/MathSum.h
	TSwfit/TSwfit/MathSum.m
	TSwift/TSwift.xcodeproj/project.xcworkspace/xcuserdata/Hunk.xcuserdatad/UserInterfaceState.xcuserstate
Now we can use ObjC and Swift