added suggested modifications

- moved species sub type from facet to term query
- added article title to article term query instead of id
- terms are now analyzed using default LowerCaseKeywordAnalyzer so case
is ignored
- content field is now analyzed using StandardAnalyzer
- keywords are not converted to slugs
- small bug fixes in the image media factory
- added humanizer to humanize facets coming out of ravendb
- removed default time component from date visited from and to on
specimen page if it had no time component.