[Solr Wiki] Update of "HudsonInfo" by GrantIngersoll

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The following page has been changed by GrantIngersoll:
http://wiki.apache.org/solr/HudsonInfo

New page:
Hudson is hosting Solr's continuous builds at http://hudson.zones.apache.org/hudson/job/Solr-trunk/

Maven nightly artifacts are being published to the Apache snapshot repository at http://people.apache.org/maven-snapshot-repository/org/apache/solr/

This takes place via a couple of steps:
 1. Hudson runs "ant clean generate-maven-artifacts" and archives the dist/maven/* directory that is created
 1. On the Hudson zone, under Grant's account, a cron job runs that copies said artifacts to the p.a.o repository once a day.  The publication script is checked into the Solr nightly SVN area as publish-solr.sh.

Due to constraints on disk space on that machine, we should always copy over the old ones (which is handled by the unique version setting).

Every now and then we may need to purge old builds.  Otherwise, they (old builds) are subject to purging by infrastructure at any point in time.  Thus, the nightly builds are "buyer beware".