(Bug 4692) Gradient themes for Crisped by Nornoriel

Last bit of the bug, themes from here:
http://dreamscapes.dreamwidth.org/119352.html

8 themes added to themes.s2, plus preview images for all.
(Bug 4692) Gradient themes for Crisped by Nornoriel

Cleaning up patch per Ninetyd's review comments. Removed redundant quotes,
moved functions after props, moved Wish to correct spot in alphabetical order.
Merge pull request #396 from LivredOr/4692_Crisped_themes

(Bug 4692) Gradient themes for Crisped by Nornoriel