media/src/binary/jeff-hammond.png: Crop to just Jeff's head

media/src/binary/jeff-hammond.png: Crop to just Jeff's head

We're just using this mugshot to attribute a quote, so there's no
space to show his whole shirt ;).  I cropped the image with GIMP [1],
and also changed from JPG to PNG to avoid further lossy-compression
degradation.  I also had to convert the color space from "sRGB
IEC61966-2.1" to "sRGB built-in" via the:

  Image -> Mode -> Convert to Color Profile

menu to avoid export-time errors:

  While parsing XMP metadata:
  Error: No XMP packet found
  lcms: skipping conversion because profiles seem to be equal:
   sRGB IEC61966-2.1
   sRGB built-in
  libpng error: known incorrect sRGB profile

  (file-png:8666): GLib-WARNING **: (/.../glib-2.36.4/glib/gerror.c:390):
    g_error_new_valist: runtime check failed: (domain != 0)
  lcms: converting from 'sRGB IEC61966-2.1' to 'sRGB built-in'

[1]: http://www.gimp.org/