closed #2909, Solve the Chinese string from C++ to JS is messy code in plugin.
fix bug: sys.localStorage.getItem() do not support utf8 in jsb.
Merge pull request #3900 from natural-law/develop

Solve the Chinese string from C++ to JS is messy code in plugin.
fix XMLHTTPRequest.cpp memory leak
Merge pull request #3901 from rablwupei/getitem_utf8

closed #2912: fix bug: sys.localStorage.getItem() do not support utf8 in jsb.
Update CHANGELOG [ci skip]
Update AUTHORS [ci skip]
Update AUTHORS [ci skip]
Merge pull request #3902 from rablwupei/xmlhttprequest_leak

fix XMLHTTPRequest.cpp memory leak
Update CHNAGELOG [ci skip]