Closes #1453. Thanks to jveber.

Closes #1442. Thanks to charlemagnelasse.

Closes #1441. Thanks to Christoph Krey.

Closes #1437. Thanks to Guillaume Bour.

Closes #1432. Thanks to Magnus Galåen.

Closes #1429. Thanks to Dustin Sallings.

Closes #1424, #1425. Thanks to JinPingChng and peteakalad.

Closes #1415 and #1422. Thanks to Karl Palsson, Till Zimmermann and Liam Fry.

Also update client documentation about automatic client ids.

Closes #1418. Thanks to Lichard Torman.

When attempting to update a user that does not exist.

Closes #1414. Thanks to kdgde.

Closes #1412. Thanks to Ryan Shaw.

This occurs when only websockets listeners are defined.

Closes #1391. Thanks to stopak.