add attack for dragon
add attack effect for knight
Merge pull request #75 from RaoZiJian/master

Add BGM, refactor G values.
Merge pull request #76 from RaoZiJian/master

Fix audio issue.
Merge pull request #77 from RaoZiJian/master

Add piglet attack1 effect
Merge pull request #78 from calfjohn/master

2 commits
Add more piglet attack effects