Clean up deprecated ColorThemes and add new ColorThemes aligned with the CSS3 changes

Proposal of themes to add: http://incubator.myxwiki.org/xwiki/bin/view/Improvements/34NewColorThemes
The deprecated themes will be available at extensions.xwiki.org:
Default http://extensions.xwiki.org/xwiki/bin/view/Extension/Default33+ColorTheme
Bordo http://extensions.xwiki.org/xwiki/bin/view/Extension/Bordo+ColorTheme
Nature http://extensions.xwiki.org/xwiki/bin/view/Extension/Nature+ColorTheme
BlueSky http://extensions.xwiki.org/xwiki/bin/view/Extension/BlueSky+ColorTheme
Inner Dark http://extensions.xwiki.org/xwiki/bin/view/Extension/Inner+Dark+ColorTheme
Nightfall http://extensions.xwiki.org/xwiki/bin/view/Extension/Nightfall+ColorTheme
Peach http://extensions.xwiki.org/xwiki/bin/view/Extension/Peach+ColorTheme