update spidermonkey 27 to 28 for win32
Feature #4916: SpiderMonkey v28 prebuilt for android/mac/ios added
Feature #4916: Update SpiderMonkey v28 include headers
Feature #4916: Upgrade manual bindings to v28
Feature #4916: Upgrade auto bindings to v28
Update docs
fix char16_t from wchar_t to unsigned int for win32
Add a document link to upgrade guide
update mozjs-27.lib to mozjs-28.lib
Merge pull request #297 from pandamicro/master

Update docs
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js into spidermonkey28
Update link in release note
Merge pull request #298 from pandamicro/master

Update link in release note
Merge branch 'SMv28' of https://github.com/pandamicro/cocos2d-js into spidermonkey28
Update release note
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Merge pull request #299 from pandamicro/master

Update release note
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js into spidermonkey28
Update submodules
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js