modified blending.
new explode model.
merge conflit.
Merge branch 'master' of github.com:ZhanruiLiang/mirrorman

Conflicts:
	display.py
	levels.py
Merge branch 'master' of github.com:ZhanruiLiang/mirrorman
new model: player die.
Improve camera.
merge conflit.
Merge branch 'master' of github.com:ZhanruiLiang/mirrorman

Conflicts:
	display.py
	objReader.py
	sprites.py