Implement /ping command

[boothj5]

By default, /ping should send a ping to users chat service.

[tdi]

Is it XEP-0199 ? http://xmpp.org/extensions/xep-0199.html

[boothj5]

Yes that's the one.

Currently /autoping uses it to try to keep connections alive for servers that disconnect due to inactivity.

However I think a /ping command with more options would be useful.

[boothj5]

Added /ping command in master. Supplying no arguments will send a ping to your chat server. Supplying an argument specifies the ping destination e.g.:

/ping jabber.org - Ping the jabber.org service
/ping dukgo.com - Ping the dukgo.com service
/ping buddy@server.com - This will ping your contacts account at their chat service (server.com), not the contacts client.
/ping buddy@server.com/laptop - Ping the users client on their laptop.

Tab autocompletion uses contacts plus their connected resources (the final example above).