added garden track... i know it's a little useless since we're switching to irrlicht but at least everything is in so we won't forget to convert it
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@3216 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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