added boss graphics, menu music, compressed mp3 file
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
basic boss done
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D

Conflicts:
	Classes/LoadingScene.cpp
	Resources/Flux.mp3
	proj.ios_mac/Moon3d.xcodeproj/project.pbxproj
delayed enemy spawn, so it doesn’t kill player instantly