code: function( key /* or object */, callback ) {
              var me = this;
              var error = function(e) { fail( e ); if ( callback ) me.lambda( callback ).call( me ); };
              root( this, function( store ) {
                  store.getFile( (typeof key === 'string' ? key : key.key ), {create:false}, function( file ) {
                      file.remove(function() {
                          if ( callback ) me.lambda( callback ).call( me );
                      }, error );
                  }, error );
              });
              return this;
          }
docs: remove a doc or collection of em