normalize all tag names to lowercase
normalize all tag names to lowercase

git-svn-id: 6ed4032d55824b87387cea7ca50eb066630d6e73@124 c93d8143-eb44-0410-8798-7b17b0fd9f9b

pagojo/rethoth,pagojo/rethoth,rgrove/thoth,pagojo/rethoth,rgrove/thoth