Summary: 1, Change bottom to be based� on height of parent. 2, Respect margin value when layout with right/bottom. Closes https://github.com/facebook/yoga/pull/552 Differential Revision: D5102090 Pulled By: emilsjolander fbshipit-source-id: dca291413ffc2027d7628f4c8b8eeeb0b4823bc2