beta 1.4

Bug removed: text version of a snippet now works
pagination no longer appears with empty page or single page
Added : a skin system. Please delete and update the theme folder !
If you want to create a new skin, make a copy of theme/default, name it
as you want and change content as you want. (use it in the config page)
Important:
If you don't want to use auto_css, just delete it and make changes in
the computed_snippetvamp.css
Otherwise, change the snippetvamp.css file.
I'll make a depository for the auto_css project later
(for french readers see
http://www.warriordudimanche.net/article128/auto-css-v1-0-une-version-stable)