add chpater6 mac template
add iOS target
add skeleton code
add more skeleton code
add new configs
finish label effect
finish label section
add menu sample code
Merge remote-tracking branch 'upstream/master'

Conflicts:
	proj.ios_mac/Programmers Guide.xcodeproj/project.pbxproj
add chapter 6 target
Merge pull request #6 from andyque/master

add chapter6 code