Add .fromPolar(), .randomDirection() and .boundMagnitude() #36
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Added methods (and tests) for .fromPolar() .randomDirection() .boundMagnitude()
.fromPolar creates a new Victor object from polar coordinates. Angle is required. Magnitude is optional and defaults to 1.
.randomDirection() creates a new Victor object with a random direction. Magnitude is optional and defaults to 1.
.boundMagnitude() bounds the magnitude of a Victor object to the magnitude specified. If the original vector is shorter than magnitude then it is left unchanged. If it is longer than magnitude, then it is scaled to have a length of magnitude (direction is preserved).