TILES-119 Modified reference to UmlGraph to version 4.6
TILES-119
Modified reference to UmlGraph to version 4.6

git-svn-id: 64d0ca227631da92532e2ab7c1519b56fd7cbde3@515083 13f79535-47bb-0310-9956-ffa450edef68

timgifford/tiles,timgifford/tiles