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.
A better approach would be to set `fs-person-details__birthPlace` to use `clear: both;` in the css, then you wouldn't need the `<br>` and it creates an even spacing for all 3 lines.