Merge pull request #17 from Ryeeeeee/master

add z-order & add gitignore
bullet missiles slower, corrected enemy spawn
updated 3d models
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D

Conflicts:
	proj.ios_mac/Moon3d.xcodeproj/project.pbxproj
Remove the files generated by ndk-build.
Update the android project configuration.
player now spins when the game starts
Merge pull request #18 from natural-law/master

Update the android project.
enemy shoots now, but bullet looks crap
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
add explosion pool