add Loading Scene
Merge branch 'master' of github.com:Wu-Hao/Moon3D

Merge with LoadingScene
Merge pull request #21 from natural-law/master

Solve the problem when game go to background/foreground on android.
added second enemy type, but need more work
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
loadingRes OK
remove invalid res
merge with master
Merge pull request #22 from fusijie/master

Add LoadingScene
finished big dude enemy
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
add hp,score and warning
corrected player
merge
Merge pull request #23 from Ryeeeeee/master

add hp,score and warning