Merge pull request #38 from tgf/evergreen

[MONDRIAN-2049] compound slicer members were not factored in aggStar sel...
[MONDRIAN-1572] fixed null pointer issue related to agg tables and many to many
[MONDRIAN-1180] Added support for Filter(Existing) natively, also fixed
issue with Native Existing.  Still need to fix issue with Non-Native
Existing found in FunctionTest._testExistingWithSlicer()
[MONDRIAN-1721] native NonEmpty() measure support