add event dispatcher for v3
Merge pull request #264 from u0u0/master

add event dispatcher for v3
add memory management for v3.0
Merge branch 'master' of https://github.com/chukong/cocos-docs
Merge pull request #265 from u0u0/master

add memory management for v3.0
How to bind a custom class to runtime
show custom runtime in catalog
Update zh.md

1. Fix some minor spelling error.
2. Play the background music endlessly. This is the normal game logic.
Update zh.md

Fix some format error.
Merge pull request #267 from sunkehappy/patch-2

Update zh.md
Merge pull request #266 from sunkehappy/patch-1

Update zh.md
Update en.md

added trailing return type
Update zh.md

fix phython to python
Update zh.md

fix phython to python
Merge pull request #269 from qiaoqinqie/master

fix the wrong word phython
Merge pull request #260 from joshuastray/master

add document for cc.game.EVENT_HIDE and cc.game.EVENT_SHOW
Merge pull request #270 from honghui/master

How to bind a custom class to runtime
Merge pull request #268 from magbetjke/patch-1

Update en.md
add sprite frame cache for v3.0
texture cache for v3.0