Add support for IE10, Firefox.

BREAKING CHANGES:
 - `card.then` → `card.promise.then`
 - `conductor.load` does not start the sandbox.  The sandbox is started
during
   `appendTo`
 - `initializeDOM` is now required to call `appendTo` for each child card,
for
   the above reason.  The default `initializeDOM` appends all children to
   `document.body`, in order.
 - `oasisURL` must now refer to the polyglot file
`conductor.js-0.1.0.js.html`.
   This file does not need to end in `html` but it does need to be served
with
   an html content type.

Updates Oasis and RSVP.

This commit should also add support for IE9, although the Superbowl demo
behaves slightly differently between IE10 and IE9.  In the latter, the video
does not transition to the survey once it finishes playing: this might be a
problem with the YouTube API however.

There remains some CSS differences between IE and Chrome in the playground.