add 'createObstacleCourse.py' example, helps reproducing

Parkour paper: https://arxiv.org/abs/1707.02286

data/stone.mtl

@@ -0,0 +1,10 @@
+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl None
+Ns 0
+Ka 0.000000 0.000000 0.000000
+Kd 0.8 0.8 0.8
+Ks 0.8 0.8 0.8
+d 1
+illum 2

data/stone.obj

@@ -0,0 +1,32 @@
+# Blender v2.78 (sub 0) OBJ File: ''
+# www.blender.org
+mtllib stone.mtl
+o Cube
+v -0.246350 -0.246483 -0.000624
+v -0.151407 -0.176325 0.172867
+v -0.246350 0.249205 -0.000624
+v -0.151407 0.129477 0.172867
+v 0.249338 -0.246483 -0.000624
+v 0.154395 -0.176325 0.172867
+v 0.249338 0.249205 -0.000624
+v 0.154395 0.129477 0.172867
+vn -0.8772 0.0000 0.4801
+vn 0.0000 0.8230 0.5680
+vn 0.8772 0.0000 0.4801
+vn 0.0000 -0.9271 0.3749
+vn 0.0000 0.0000 -1.0000
+vn 0.0000 0.0000 1.0000
+usemtl None
+s off
+f 1//1 4//1 3//1
+f 4//2 7//2 3//2
+f 8//3 5//3 7//3
+f 6//4 1//4 5//4
+f 7//5 1//5 3//5
+f 4//6 6//6 8//6
+f 1//1 2//1 4//1
+f 4//2 8//2 7//2
+f 8//3 6//3 5//3
+f 6//4 2//4 1//4
+f 7//5 5//5 1//5
+f 4//6 2//6 6//6