Add ngFsCouplePortrait directive for use in the new add flow.

@lambertsteven Can you take a look at this and merge it? This is the new ngFsCouplePortrait directive. There's also a pull request in fs-styles for the matching styles. Thanks.
It would seem that I made this mistake in ngFsCoupleInfo without realizing it (hurray copy paste). Since there is no `$scope.person`, does this `$watch` actually update?