y,z up
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
remove un-needed files
add MainMenuScene
Merge github.com:Wu-Hao/Moon3D
modify
Merge pull request #27 from fusijie/master

completed enemy preload.
change
add MainMenuScene
Merge github.com:Wu-Hao/Moon3D
Merge pull request #28 from Ryeeeeee/master

add MainMenuScene & modify hp view
background audio
merge
Merge pull request #29 from yuye-liu/master

background audio and shader bug fixed
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D

Conflicts:
	proj.ios_mac/Moon3d.xcodeproj/project.pbxproj