Merge pull request #180 from TsudaKageyu/master

Fixed possible memory leak
Removed config.h and moved macros into taglib_config.h
Prefixed public variables
Separated public and private config.h
Fixed comments in tstring.h
Merge pull request #188 from TsudaKageyu/string-comment

Fixed comments in tstring.h
Removed RefCounter implementation from a public header
Removed TAGLIB_HAVE_STD_WSTRING macro that affects the public ABI
Fixed mismatched macro names
Merge pull request #187 from TsudaKageyu/config

Removed config.h and moved macros into taglib_config.h