SolrJ new javabin format

[Shawn Heisey]

 The CHANGES.txt file in branch_3x says that the javabin format has 
changed in Solr 3.1, so you need to update SolrJ as well as Solr.  Is 
the SolrJ included in 3.1 compatible with both 3.1 and 1.4.1?  If not, 
that's going to make a graceful upgrade of my replicated distributed 
installation a little harder.

Thanks,
Shawn