docs: function addFiltersToModel(model, appName) {
      var rootDir = this.pancakes.getRootDir();
      var apps = ['common', appName];
      var me = this;
  
      // if filters don't exist in memory yet for given app, get them
      if (!filters[appName]) {
          filters[appName] = {};
          _.each(apps, function (app) {
              var filtersDir = rootDir + '/app/' + app + '/filters';
              var exists = utils.doesFileExist(filtersDir);
  
              if (exists) {
                  _.each(fs.readdirSync(filtersDir), function (fileName) {
                      var filterName = me.pancakes.utils.getCamelCase(fileName);
                      filters[appName][filterName] = me.pancakes.cook('app/' + app + '/filters/' + fileName, null);
                  });
              }
          });
      }
  
      _.extend(model, filters[appName]);
  }