code: function (keys, options) {
              var views = [];
              var len = keys.length;
              var i = -1;
              while (++i < len) {
                  views.push(this._init(keys[i], options));
              }
              return views;
          }
docs: Given an array of keys, a subview
  will be instantiated for each key
  based on the configuration for that
  key. The options param will be
  passed to each view on instantiation
  as additional options.
  
  @memberOf SubViewManager#
  @param {String[]} keys
  @param {Object} options
  Additional options to pass
  to each view on init
  @return {Backbone.View[]}
  Array of newly created subviews