Change the version
A better way to generate the sitekey
Bump the version to 3
Fix _isChromeExtension to test for testing 'undefined'.
Bind mousedown to _selectPassword instead of click.

Event click is dispatched from touch events as well as mouse events, but
the selection behavior only makes sense with pointing devices.
Update appcache version.

  $ echo "# `date`" >> skeletonkey.appcache