Added configuration for Solr 4.0. Fixes #81.
Removed @waitFlush from requests. Fixes #82.

See "commit" and "optimize" on
http://wiki.apache.org/solr/UpdateXmlMessages.

We don't actually change the default on these, so the behavior using
earlier versions of Solr won't change.
Added required labels to facets created in tests.
Merge branch 'feature/solr4' into develop