restructured package, rewrote Vector3D class around a core tuple of coordinates, began writing PointSet class
changed form points to coords, added more ideas about hashability to Vector docstring
added __hash__ function for equality comparison
built out more of the PointSet class
made Vector3d class immutable, dhanged to lowercase d in 3d, added __eq__() method to Vector3d so that it will return true when compared to a tuple with the same floats
added iter function to PointSet, plus more points
adding methods for set operations on PointSet
added some basic set methods to PointSet
built out and tested Matrix class
beginning to set up line and plane classes
angle between vectors, angle between planes
plane plane intersection
creating rhino import and export
tested plane intersections in Grasshopper - it checks out
refactoring points and vectors for 2d and for clarity
more refactoring to prepare for merge with master branch
repaired imports for mesh module