initialization. Added native target duplicate method
added target duplication
modified target duplication
Merge ../xcodeproj

Conflicts:
	README.md
	ext/xcodeproj/extconf.rb
	lib/xcodeproj.rb
	lib/xcodeproj/config.rb
	lib/xcodeproj/constants.rb
	lib/xcodeproj/project.rb
	lib/xcodeproj/project/object.rb
	lib/xcodeproj/project/object/build_configuration.rb
	lib/xcodeproj/project/object/build_phase.rb
	lib/xcodeproj/project/object/configuration_list.rb
	lib/xcodeproj/project/object/file_reference.rb
	lib/xcodeproj/project/object/group.rb
	lib/xcodeproj/project/object/native_target.rb
	lib/xcodeproj/project/object/root_object.rb
	lib/xcodeproj/project/object/target_dependency.rb
	lib/xcodeproj/project/object_attributes.rb
	lib/xcodeproj/project/object_list.rb
	lib/xcodeproj/scheme.rb