.jshintrc global aren't being picked up

[andywillis]

Apologies, I tried to submit a PR but the tests failed or failed to run at all (I'm developing on a Windows machine - le sigh).

Summary
I noticed that when I was using this module the global options I had set up in my .jshintrc file were not being picked up by jshint. According to this comment the globals need to be passed in as the third parameter when calling jshint.

My PR would have looked like this:

JSHinter.prototype.processString = function (content, relativePath) {

  var globals;
  if (this.jshintrc && this.jshintrc.globals) {
    globals = this.jshintrc.globals;
    delete this.jshintrc.globals;
  } else {
    globals = {};
  }

  var passed = JSHINT(content, this.jshintrc, globals);
  var errors = this.processErrors(relativePath, JSHINT.errors);

  if (!passed && this.log) {
    this.logError(errors);
  }

  if (!this.disableTestGenerator) {
    return this.testGenerator(relativePath, passed, errors);
  }
};

Any chance someone could make the pull request for me?