refactor: pass options.global as predef arg to JSHINT (#216)

The JSHINT [API](http://jshint.com/docs/api/) specifies that `globals` actually get passed as the `predef`, the 3rd argument to the function and not part of the `options`. This fixes that.

Compare with CodeMirror's jshint integration: https://github.com/codemirror/CodeMirror/blob/e49a19f5cacb447558f162014eb26b8c45b30941/addon/lint/javascript-lint.js#L31

src/rules/jshint.js

@@ -28,7 +28,7 @@ HTMLHint.addRule({
                         styleCol = event.col - 1;
                     var code = event.raw.replace(/\t/g,' ');
                     try{
-                        var status = jsVerify(code, options);
+                        var status = jsVerify(code, options, options.globals);
                         if(status === false){
                             jsVerify.errors.forEach(function(error){
                                 var line = error.line;