Get rid of unused directories in model repository.
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@691 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
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git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@691 67173fc5-114c-0410-ac8e-9d2fd5bffc1f