FB Connect modal; put create and connect existing account all in the same modal

Please do not merge. This should be retargeted.

The old version of FB connect displayed a modal when users choose to login via the user menu.  This modal allowed them to create a new account, or click a button that would take them to a sign in page.  Rather than split the experience, put create and sign-in in the same modal.

https://wikia-inc.atlassian.net/browse/UC-111