kiji-modeling: Added Locality Sensitive Hashing to RecommendationPipe

review: https://review.kiji.org/r/1557
contributed-by: arpanghosh (Arpan Ghosh, arpanghosh@gmail.com)
commit: https://github.com/kijiproject/kiji-modeling/commit/1812dd78be152cd1edaaa47c7870ff586fafa404