Fix matrix-vector multiplication #268
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Addresses #267.
I didn't check vector-matrix multiplication. Just submitting this PR for discussion.
I don't like this because it feels very hardcoded. Ideally, multiply should check dimensions and handle 1×1, 1×2, 2×1 & 2×2.
Ideally, matrix multiplication should work for matrices of arbitrary dimensions and is quite straightforward to implement - and use blas only for 2×2.