solr search by month/date: initial work
addresses #46: allow solr search by specific date, any year
add year to page solr_doc, helps in faceting
faceting on year and state
faceted search - more work
facet by county too
update ubuntu install instructions for solr 4.4
Merge pull request #79 from LibraryOfCongress/_solr_search_by_date

had NDNPQR run off of this feature branch for two weeks. Things look good. Merging this back into master