Use static sky-cons
Hide header
Fix name/spaces bug

Fix spaces in the name causing URL to not load. Flag hide-header still
true in this version, so remove if you want the location printed.
Respect width

Specify scale and clip width to force window to a particular width. See
paulhammond/webkit2png#12 and paulhammond/webkit2png#66 for details of
the underlying webkit2png issue.