Update jquery.mustache.js

Added "getTemplate" to use this cool jQuery extension with Hogan.JS.

Example:

      $.Mustache.load('./templates.htm').done(function() {
        var template = $.Mustache.getTemplate('plaintext');
        var compiledTemplate = Hogan.compile(template);
        var renderedTemplate = compiledTemplate.render();
        
        console.log(renderedTemplate);
      });