Code is functional. Towards #264.

rotation about an origin. Towards #264.

…).

as a quaternion, towards #264.

Feature/quaternion

…ng for long, large renders.

Also adding associated unit tests.
These features arose out of the testing process for #270.

in PR #271.

Adding Quaternion.conjugate() and improving tests.

…n case through cone tip.

Inner point calculation has been made more robust.

Swapped quaternion argument order. Closes #280.

The Python built-in min() and max() functions are very slow on
memoryviews, and Numpy's min and max are also slow when called many
times on small memoryviews (e.g. coordinate arrays). This commit adds
functions which operate at the C level to quickly calculate the max,
min and peak-to-peak values of a memoryview to a 1D array of type
double.

Add functions for max, min and peak-to-peak values of memoryviews

Moved tests into the cython package.

Feature/mvmath