Merge pull request #17 from XChinux/master

fix src.pri's LIBS for mingw links error in FileUtil
修改OS.cpp 29行defined
增加g++加速编译选项和加速编译文件tianchi_gcc_pch.h
Merge pull request #18 from cnhemiya/master

fix 修改OS.cpp 29行defined
update by Jonix

class Chinese Bug Fixed
class String 完善
modified signals/slots/emit keywords to Q_SIGNALS/Q_SLOTS/Q_EMIT macros