Remove numpy dependency

examples/pybullet/unittests/utils.py

@@ -0,0 +1,7 @@
+def dot(A, b):
+    """Dot product between a 2D matrix and a 1D vector"""
+    return [sum([aij*bj for aij, bj in zip(ai, b)]) for ai in A]
+
+def allclose(a, b, tol=1e-7):
+    """Are all elements of a vector close to one another"""
+    return all([abs(ai - bi) < tol for ai, bi in zip(a,b)])