put the version of haystack being used subtly into both views; this is *mostly* important to me while balancing support for 1.2 and 2.x
as far as I can tell, I horribly broke Whoosh support at some point, but bits of it worked, occasionally. Yay.
Anyway - fields in FacetWrapper need to be dictionaries even if none are given, otherwise iterating over .items() later fails.