Merge pull request #374 from u0u0/master

2048 part 2
Merge pull request #4 from chukong/master

merge from upstream
[Cocos2d-JS] Improve beta docs
[Cocos2d-JS] Add change log and release note for rc0 release
[Cocos2d-JS] Upgrade AssetsManager doc
[Cocos2d-JS] Rename bakeLayer folder to bake-layer
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
[Cocos2d-JS] Improve beta upgrade guide
[Cocos2d-JS] Add upgrade guide for 3.0 rc0
Merge pull request #375 from pandamicro/master

[Cocos2d-JS] Prepare for Cocos2d-JS v3.0 RC0 release
add spine and ccconsole
Merge pull request #376 from gloryming/master

add spine and ccconsole
Update zh.md
fix cases
Merge pull request #378 from gloryming/master

fix cases
modify wrong words.
Merge pull request #377 from renshan/patch-1

Update zh.md
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
Merge pull request #379 from Ivenyang/master

modify wrong words.
change link to translated version