Moera browser extension for Chrome 0.2.0 @ Moera²

Moera browser extension for Chrome 0.2.0 is now available in Chrome Web Store. Download and install at https://chrome.google.com/webstore/detail/moera/endpkknmpgamhhlojbgifimfcleeeghb.

Fixed bug that caused Web UI to be shown for a short time even when the browser extension is installed.
If several clients are used, keep each client's data isolated from others.
Allow to register several connections and to switch between them.
Keep Moera naming service cache.
Improved usability of the Preferences page.