Really, really make sure capybara uses thin.
Fix Ember always redirecting to boards path.

Woops, picked the wrong route to define there.
Make deep linking work for source page.
Allow deep linking directly to a board.

Also refactored the API controller a tiny bit to use respond_with, which
mostly worked awesome.

It tried to build a URL for the created board, which is neat but not
quite correct by default in this case.  I give it the API path for the
board, though it's not used at all by ember.
Migrate other API controllers to respond_with.

Me likey.