Upgraded existing files in BoboBrowse.Net.Facets.Impl namespace types to version 3.1.0 compatibility.
Implemented PathFacetCountCollector for version 3.1.0.
Upgraded MultiValueFacetFilter to 3.1.0.
Implemented the AdaptiveFacetFilter, BitSetFitler, GeoFacetFilter, GeoSimpleFacetFilter, and IFacetValueConverter types (the remaining types in the BoboBrowse.Net.Facets.Fitler namespace).
Implemented BoboCustomSortField (version 3.1.0).