code: function (name) {
  		var prop = this.properties[name];
  		if (prop) {
  			this.stopListening(prop, EVENT_CHANGE, this.change);
  			delete this.properties[name];
  			return prop;
  		}
  		return null;
  	}
docs: Remove a single property from the map
  @param {String} name Property name
  @return {?module:ok.Property} Removed property or `null`