Add warner's myfx-tabthing device information fetching libraries.
Add 'social.tabs.request-events-response' replying with local device information.
Don't say anything about device's online status for now.
Kill trailing whitespace.
Push tabs to server.
Add async.js to worker.
Standardize `log` function in sidebar.js and worker.js.
Fetch tabs from server and render them.
Add trivial polling sync.