* Variables:
- uri (callback: load the uri)
- verbose: affects output on stdout
- - mode:insert or command mode
- inject_html
- - base_url: used when passing html through stdin
- - html_endmarker: delimiter when passing html through stdin
- - html_mode_timeout: consider end of html input after x seconds when no endmarker found
- keycmd: holds the input buffer (callback: update input buffer)
- status_message (callback: update title)
- show_status: show statusbar or not