code: function getBehavioralDirectives(appName) {
      var directives = {};
      var me = this;
  
      _.each(this.getAppFileNames(appName, 'jng.directives'), function (directiveName) {
  
          // if not a JavaScript file, ignore it
          if (!me.pancakes.utils.isJavaScript(directiveName)) { return; }
  
          // get the directive and load it into the directive map
          var directivePath = 'app/' + appName + '/jng.directives/' + directiveName;
          var directive = me.pancakes.cook(directivePath, null);
          directiveName = directiveName.substring(0, directiveName.length - 3).replace('.', '-');
          directives[directiveName] = directive;
      });
  
      return directives;
  }
docs: Add behavior directives from the jng.directives folder.
  @param appName