code: function Collection(nameOrExisting, options) {
              if (nameOrExisting instanceof Mongo.Collection) {
                  this._collection = nameOrExisting;
              }
              else {
                  this._collection = new Mongo.Collection(nameOrExisting, options);
              }
          }
docs: Creates a new Mongo.Collection instance wrapped with Observable features.
  @param {String | Mongo.Collection} nameOrExisting - The name of the collection. If null, creates an
  unmanaged (unsynchronized) local collection. If provided an instance of existing collection, will
  create a wrapper for the existing Mongo.Collection.
  @param {ConstructorOptions} options - Creation options.
  @constructor