add a reversible field to editor
empty search box -> return all recent cards in feed view
beef up the editor page
comment fix
fix 500 error trying to review cards
Clean up HTML and CSS for feed card buttons

When the buttons fade out, the "Edit" link no longer hangs around for
too long, I also fixed it to look like a proper button.

I began to do some proper CSS class-prefixing, e.g., ".feedcard
.btn-container" rather than allowing .btn-container to be a top-level.

Also did some quick cleanup to put each CSS selector on its own line.
This way, it's much easier at-a-glance to see that ".class1, .class2"
actually refers to two separate selectors and not  ".class1  .class2".
Style editor, hook up jQuery Tags Input plugin

I moved reset.css into its own file, and re-ordered the CSS imports so
the cascade can work properly (reset, bootstrap, flat-ui, our CSS).
Simplify header component and fix its misbehaving styles

Our bespoke header CSS was conflicting with the flat-ui styles, so now
we override them in a few ways. Nav buttons are now flush with the
bottom of the nav bar!
Use :hover to simplify feed card mouseenter / mouseleave tracking