fix pybullet.c compilation for Windows

add lego.urdf, duck.urdf (optimized using VHACD convex decomposition)
optimize Kiva shelf collision model (by hand, using boxes/Blender)
physics timescale toggle between  1 -> 0,25 -> 0

data/duck.mtl

@@ -0,0 +1,13 @@
+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl blinn3
+Ns 96.078431
+Ka 0.000000 0.000000 0.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Ka duckCM.png
+map_Kd duckCM.png