Handle Collection synchronization

1. Follow this documentation to setup Collections synchronization.
2. create a File document with an attachment.
3. In personal workspace create a collection and add a file to it
4. Synchronize the collection
5. Double-check the root is present in the root list
6. Wait for complete sychronization cycle.
7. Double-check the file has been synchronized.
8. Now change the attachment in the File Document. Wait for synchronization cycle -> nothing.
9. Create another File document
10. Add it to the collection
11. Double-check the client is doing a synchronization cycle
12. 2 updates are now detected (see updatesDetected.png)
13. also the client keeps synching and synching with the following error:

    2017-03-13 12:25:50,969 17087 123145305600000 ERROR    nxdrive.engine.watcher.remote_watcher __new__() takes exactly 18 arguments (15 given)
    Traceback (most recent call last):
      File "nxdrive/engine/watcher/remote_watcher.pyc", line 477, in _handle_changes
      File "nxdrive/engine/watcher/remote_watcher.pyc", line 642, in _update_remote_states
    TypeError: __new__() takes exactly 18 arguments (15 given)
    2017-03-13 12:26:26,657 17087 123145305600000 ERROR    nxdrive.engine.watcher.remote_watcher __new__() takes exactly 18 arguments (15 given)
    Traceback (most recent call last):
      File "nxdrive/engine/watcher/remote_watcher.pyc", line 477, in _handle_changes
      File "nxdrive/engine/watcher/remote_watcher.pyc", line 642, in _update_remote_states
    TypeError: __new__() takes exactly 18 arguments (15 given)
    

This seems to prevent any further synchronization.