Merge pull request #1 from ent-worm/master

Pre-work
JAVACC test
fix test.jj
JSqlParserCC.jj 作为例子 看这个程序是怎么运用JAVACC来做词法分析的
增加现有工具比较列表
modified exist_tools.md   add ANTLR rule
for test
完善工具调研
Merge branch 'dev' of github.com:ent-worm/MySQLParser into dev