Danny Robson c917f264c4 quaternion: fix incorrect factorisation in as_matrix
One of the terms in m[0][0] and m[1][1] was incorrectly negated from an
incomplete factorisation when I transcribed the formula.

Also reintroduces the axis-rotation tests which inadvertantly had zero
magnitudes.
2016-09-14 16:49:26 +10:00
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