Interesting new features:
 * unix domain support
 * copy & paste with browser integration (Ctrl+C, Paste from browser in
 * popup)
 * warn before closing
 * fix bug when zooming from browser

For compatibility, the new shellinabox is named 'shellinabox-github'.
The previous component with ipv6 support is kept as 'shellinabox-2.10'
and is still the default when using 'shellinabox'