Enabled UNICODE support and double quote escaping

Enabled char streams that support UNICODE characters
Updated QUOTED_IDENTIFIER token definition to allow for double quote escaping
Added Junit Tests
UNICODE option set to true, pom modified
Changed groupId. Double quotes are unescaped by the parser
Changed README file
Committer: therealluigi
Merge branch 'master' of https://github.com/tke/JSqlParser