- Mouse movements are accumulated and sent about 5 times a second.
- Normal polling happens at about 1.5 seconds intervals.

This commit represents a very functional VNC client under Google
Chrome.

Remaining work:

    - Cut and paste support.

    - Framing bugs when using RRE encoding.

    - Better status and error feedback.

    - Get working in firefox using flash web-socket-js:
        http://github.com/gimite/web-socket-js

    - Version without mootools (but test cross-browser).