Update README.md

Update reversion 0.2.1.34500

Update binaries corresponding to SAO Utils Beta 1 Update 1

Fix bugs in Demo Source Data project

Fix NERvCopyString(const wchar_t*, size_t, wchar_t*), close #7

Improve VERSION comparison

Improve UID declaration and definition

Add extra constructing process for component objects

Add quit, destroy and key events

Fix a missing name space issue in NVG_BEGIN_INTERFACE_INFO() macro

Downgrade sample projects and solutions to Visual Studio 2005.

Improve compatibility between different compilers.

Update .gitignore files.

Add Demo Extension plug-in.

Update README.md