Get fully embedded JSON working again.

That was fun.  Couldn't get sideloading to work properly, and I wanted
embedding anyway.  There aren't going to be hardly any shared objects
across records, so there's not much benefit to sideloading.
Remove all references to layout.

Now that we're going the Ember route, all of this building of the markup
on the server side ain't happening.
Fix some tests that ate it during refactoring.
Very incomplete but working layout presentation.

Pane objects are found for the correct position.  It's unclear whether I
can go this route or will have to fight Ember views some more.
Delete references to a Perspective and Pane.

I'm going to make this simpler to start.  There's a lot of code there
that may never be necessary.
Be super specific about the hstore gem commit.

So I can make sure I'm using the same one in the implementing gem until
they actually release the changes I require.
Get templates rendering from sources, sort of.

Live updating is jacked.  It seems like it should work according to the
docs, but it's failing in spectacular silence, or with cryptic errors
(that have never been seen before on Google, apparently) when you follow
the documentation.  So that's fun.