message: Use protected instead of private props in Source
diff: @@ -25,13 +25,13 @@ export interface SourceOptions {
  */
  @evented
  export default class Source implements Evented {
  - private _name: string;
  - private _bucket: Bucket;
  - private _keyMap: KeyMap;
  - private _schema: Schema;
  - private _transformLog: TransformLog;
  - private _requestQueue: ActionQueue;
  - private _syncQueue: ActionQueue;
  + protected _name: string;
  + protected _bucket: Bucket;
  + protected _keyMap: KeyMap;
  + protected _schema: Schema;
  + protected _transformLog: TransformLog;
  + protected _requestQueue: ActionQueue;
  + protected _syncQueue: ActionQueue;
  // Evented interface stubs
  on: (event: string, callback: () => void, binding?: any) => void;
  