add specialAttack for knight
add special Attack for archer
Merge branch 'master' of https://github.com/fusijie/FantasyWarrior3D

Conflicts:
	src/BattleScene.lua
	src/Knight.lua
modify Model to model
Merge pull request #72 from calfjohn/master

2 commits
Merge pull request #73 from RaoZiJian/master

Send drop blood command ui effect