bugfix addVertex -> vertexAdd (#841)
bugfix addVertex -> vertexAdd (#841)


vtalas/joint,clientIO/joint,gagaboy/joint,vtalas/joint,DavidDurman/joint,vtalas/joint,DavidDurman/joint,gagaboy/joint,kumilingus/joint,clientIO/joint,kumilingus/joint,clientIO/joint,DavidDurman/joint,clientIO/joint,kumilingus/joint,gagaboy/joint,kumilingus/joint