typo in hello-back
rewrite chat.js to not include any UI.  Put chat UI into ui.js.  Include templates to support that UI.  Make chat scroll again.
remove unused template
Make close button work.  Make assertionerrors a little nicer
Catch some more LESS errors and display them
Factor out prefixed transition rules
Make the window draggable
remove copy button
merge
Add chat catch-up when someone enters late or reloads