Merge pull request #1513 from pandamicro/develop

Merge develop to develop-3.0
Merge branch 'develop-3.0' of https://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #1542 from xingsenma/develop

closed #3909: Correct _strStringValue to _stringValue for gui LabelBMFont
Closed #3910: Modify vertex attribute flag name to adapt with JSB
Merge pull request #1543 from dingpinglv/Iss3910_VertexAttribFlag

Closed #3910: Modify vertex attribute flag name to adapt with JSB
Complete full screen API list
Fixed #3916: Extra check for firefox mobile to avoid this issue
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop
Merge pull request #1544 from pandamicro/develop

Fixed #3916: Extra check for firefox mobile to avoid this issue
Closed #3875: Refactoring cc.FadeIn and cc.FadeOut to fix a bug that its start opacity isn't current value.
Merge pull request #1548 from dingpinglv/Iss3875_FadeInFadeOut

Closed #3875: Refactoring cc.FadeIn and cc.FadeOut to fix a bug that its start opacity isn't current value.
Refactor #3985: arguments length check replaced by undefined check in engine
Refactor #3985: arguments length check replaced by undefined check in extension
Bug in SceneReader setPropertyFromJsonDict
Merge pull request #1550 from jandujar/issue_1549

Bug in SceneReader setPropertyFromJsonDict
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop

# By Jose Antonio Andújar Clavell (1) and dingpinglv (1)
# Via dingpinglv (2) and Jose Antonio Andújar Clavell (1)
* 'develop' of https://github.com/cocos2d/cocos2d-html5:
  Bug in SceneReader setPropertyFromJsonDict
  Closed #3875: Refactoring cc.FadeIn and cc.FadeOut to fix a bug that its start opacity isn't current value.
Merge pull request #1551 from pandamicro/develop

Refactor #3985: arguments length check replaced by undefined check
Refactor #3985: Correction of bug
Refactor #3985: Make undefined check more compatible
Merge pull request #1552 from pandamicro/develop

Refactor #3985: Correction of bug