Hello sympy planet! 
Is there any reason for the following behavior?

In sympy 1.0:
>>> import sympy as sy
>>> M1 = sy.Matrix.zeros(0, 0)
>>> M2 = sy.Matrix.zeros(0, 1)
>>> M3 = sy.Matrix.zeros(0, 2)
>>> M4 = sy.Matrix.zeros(0, 3)
>>> sy.Matrix.hstack(M1, M2, M3, M4).shape
(0, 6)

But in sympy 1.1:
>>> M1 = sy.Matrix.zeros(0, 0)
>>> M2 = sy.Matrix.zeros(0, 1)
>>> M3 = sy.Matrix.zeros(0, 2)
>>> M4 = sy.Matrix.zeros(0, 3)
>>> sy.Matrix.hstack(M1, M2, M3, M4).shape
(0, 3)

whereas:
>>> M1 = sy.Matrix.zeros(1, 0)
>>> M2 = sy.Matrix.zeros(1, 1)
>>> M3 = sy.Matrix.zeros(1, 2)
>>> M4 = sy.Matrix.zeros(1, 3)
>>> sy.Matrix.hstack(M1, M2, M3, M4).shape
(1, 6)

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