termlist for version 0.90.2
deleted old date histogram
deleted obsolete files
Merge remote-tracking branch 'origin/feature/0.90-termlist' into
feature/0.90

Conflicts:
	src/main/java/com/pearson/entech/elasticsearch/plugin/approx/FacetPlugin.java
	src/main/java/com/pearson/entech/elasticsearch/search/facet/approx/termlist/InternalTermListFacet.java
	src/main/java/com/pearson/entech/elasticsearch/search/facet/approx/termlist/TermListFacet.java
	src/main/java/com/pearson/entech/elasticsearch/search/facet/approx/termlist/TermListFacetBuilder.java
	src/test/java/com/pearson/entech/elasticsearch/search/facet/approx/datehistogram/DistinctDateHistogramFacetTest.java
Package renaming