HM: First steps towards lucene 4.8
HM: Lucene working with simple standard facetting; Also Dedup working
HM: All working except hierarchical drilldown
TJ/HM: All test working
TJ/HM: FacetsConfig in index
TJ/HM: Hierarchical facets also working with lucene 4.8.0
TJ/HM: Unknown facet fields return empty list
HM/TJ: Lucene 4.8
HM/TJ: build deps.