修改README

git-svn-id: https://qlanguage.googlecode.com/svn/trunk@278 6d982bb3-a5a7-393d-ffc5-582415be9c85
1.修改BNF
2.SyntaxTree

git-svn-id: https://qlanguage.googlecode.com/svn/trunk@279 6d982bb3-a5a7-393d-ffc5-582415be9c85
修正MinGW编译失败

git-svn-id: https://qlanguage.googlecode.com/svn/trunk@280 6d982bb3-a5a7-393d-ffc5-582415be9c85