Pull request for adding a new checker for jslint4java

Added a new checker for jslint4java. It is a java wrapper around jslint and provides a simple interface for detecting potential problems in JavaScript code. 

I have added a new  item for jslint4java into [Syntax Checkers Wiki](https://github.com/novaez/syntastic/wiki/Syntax-Checkers) and linked it to [JavaScript: jslint4java](https://github.com/novaez/syntastic/wiki/JavaScript%3A---jslint4java). 

Please review. Thanks!