Jabber Notification Plugin for Hudson

Jabber notification plugin for Hudson.

Based on the original work of Uwe Schaefer, it adds the following features:
- send notifications to Jabber groupchats (MUC)
- send notifications to users who break builds
- send notifications to users who fix builds
- groupchat bot that accepts several commands:
- build <job> [now|<delay[h|m|s]>]: build a job, with the configured quiet period, right now (evil hack around bug 356), or with a custom wait time specified in hours, minutes or seconds
- status [<job>]: shows the status (SUCCESS, ERROR, ...) of a specific jobs (e.g. "!status somejob") or of all jobs (e.g. "!status")
- queue: shows the state of the build queue
- configure Jabber IDs for users
- configurable bot command prefix (defaults to "!")