文档修改
Merge branch 'master' of https://github.com/passAndPush/StreetFighter.git
Merge branch 'master' of https://github.com/passAndPush/StreetFighter.git
Merge branch 'master' of https://github.com/passAndPush/StreetFighter.git
系统结构调整，以后场景内entity创建后加入scene可以在init函数内执行