Summary:
Fixes ```align-content:strech``` on nodes without specified cross dimension, if there are multiple lines. Currently it uses the full height of the parent, but it has to use the line height. As we don't know the number of lines until here, we need to realign the relevant children.
Closes https://github.com/facebook/yoga/pull/368
Reviewed By: gkassabli
Differential Revision: D4528559
Pulled By: emilsjolander
fbshipit-source-id: 019e6f85fa452d0c3412f711e3886f0c4452da47
063f65d065