issue #171

* added ws.max_clients flag to limit the max WebUI clients
* TODO: Feed back an error to the UI to indicate why they're getting
  rejected.
Added {"error":...} stanza on socket fail
Issue #171 Added {"error":...} stanza on socket fail
Merge branch 'master' of github.com:jrconlin/FindMyDevice
Normalize ws_ opts to ws.

* Added temp handlers for older ws_* config
* Next major release should drop those.
Update config-sample.ini

clean up and group.
Update config-sample.ini

limted is perfectly cromulent.
Merge pull request #209 from jrconlin/master

Issue #171