Add Jappix to Instant Messaging Apps list and Metronome IM between XMPP Servers list.

Properly add Jappix between Instant Messaging applications, it's a full fledged xmpp web client (and also has scarce support for Buddycloud since they use custom pubsub extensions)

EDIT:
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Also add Metronome IM between the servers list, it's a personal project which I opensourced recently based on Prosody. While retaining in common several features with Prosody, the project is aimed to provide a more extensive support to microblogging (PEP/pubsub), administration tasks (user registration, whitelisting, etc), muc (pluggable configuration, superuser admins, etc) while remaining as resource conservative as possible.
It's currently the suggested XMPP Server for both *Jappix* and *Movim*, and the default XMPP server in the *Yunohost Linux distribution* ( http://yunohost.org )

Sorry about the double submission, but I don't know how to bisect the pull requests with github.