SAK-23824

Create utility class usable across Sakai that captures the rules for skin naming

org.sakaiproject.portal.util.CSSUtils
   CSSUtils.getCssToolBase()
   CSSUtils.getCssToolSkin(skin)
   CSSUtils.getCssToolSkin(site)
   CSSUtils.adjustCssSkinFolder(skinFolder)



git-svn-id: https://source.sakaiproject.org/svn/portal/trunk@127916 66ffb92e-73f9-0310-93c1-f5514f145a0a