feature/vector-utils

[fragmuffin]

Vector and Plane utilities to allow a bit more flexibility.

[fragmuffin]

I'd also like to put some utilities into cadquery.Plane to allow instantiation from Euler angles, or quaternion (and visa versa)...
But I've been sitting on this branch for a while, I thought it was time to make a PR

[coveralls]

Coverage increased (+0.3%) to 87.109% when pulling b685b39 on fragmuffin:feature/vector-utils into 2fe0e0f on dcowden:master.

[jmwright]

@dcowden Do you have time to review this? I can, but you're probably better qualified.

[dcowden]

Yep, I got it!

[dcowden]

I'm merging this-- @fragmuffin thanks for the contribution.
This is a ton of new functionality-- thanks for adding the tests.

The tests will be great when we move from an FreeCAD implementation to an OCC implementation later on.

[fragmuffin]

No problem @dcowden
Tests have a somewhat beautiful way of simplifying code review don't they... although they're often a pain to write & maintain.