initial implementation complete, untested, undocumented

[#71505794]
minor commit to test pivotal integration

[#71505794]
Implement Alex's suggested refactor to break out feature engineering

[#71505794]
test of featureEngineering framework

[#71505794]
test the enricher

[#71505794]
last test, 89% line coverage - still needs doc and maybe naming work

[#71505794]
refactor based on Alex's suggestion, make it easier to combine multiple enrich strategies

[#71505794]
documentation

[#71505794]
minor issue, inappropriate nullable

[#71505794]
Merge pull request #19 from sanity/attribute-classification-probabilities-71505794

Unit tested and reviewed, good to merge