add initial pybullet module, using the shared memory API

(for now, start the example browser in 'physics server',
then compile using premake --python option,
then run python in the bin folder (so it finds pybullet.so)
and run the test.py script in examples/pybullet folder.
The robotics shared memory C API is very suitable for this.

examples/pybullet/test.py

@@ -0,0 +1,7 @@
+import pybullet
+pybullet.loadURDF('r2d2.urdf')
+pybullet.loadURDF('kuka_lwr/kuka.urdf',3,0,0)
+
+for x in range(0, 1000000):
+	pybullet.step()
+