[EXT-3] vBulletin One Row Auth

Removed code that generated buttons.  Replaced with Widget.  Updated
CSS to override widget styling that didn't play nice with vBulletin
default theme.
[EXT-3] fixed settings location, css cleanup

found a cleaner way to make the styling work, moved the settings to
where they should live, fixed the return experience.
Merge pull request #1 from byron-janrain/master

[EXT-3] vBulletin one row auth