added lens
Merge branch 'functorx2' into lens
fixed bug in lens
Moved functor instances to FunctorBase
Merge branch 'functor' of github.com:maxpow4h/swiftz into lens
Merge branch 'master' into lens

Conflicts:
	swiftz.xcodeproj/project.pbxproj
Merge pull request #23 from maxpow4h/lens

Lens merged