Syncing to the version now in emacs ELPA repository.

These changes were authored by Stefan Monnier in commits:

monnier@iro.umontreal.ca-20130801182238-5dlw5a7czjkv6dz8
* packages/websocket: Cleanup copyright and code.

and

monnier@iro.umontreal.ca-20130803023536-zh9uf43vws6idygu
* packages/websocket/websocket.el: Fix version number.