New Node: SortCircleNode

Sorts input geometry according to topology to make external topology
more useful.
Still has some problems.
Works with more than one object

Added per face mode.
Either calculate the area for each face in an object or the sum of all
faces in object.
Works with more than object
Merge pull request #3 from nortikin/master

Changes in center polygon
Small fix

removed print statements
Working

But very ugly code.
Multiple objects

Correct output format, can calculate area per object or per face in
object.
Removed prints
Merge pull request #4 from nortikin/master

bugfix unregistration
Merge pull request #5 from nortikin/master

todo + viewer active bool
Added min, max functions
2 new functions: Cell and Noise

Provides 4 new functions,
Vector and Scalar noise from cell and noise (perlin) from
mathutils.noise library
Updated

Min and max functions
Vector math

Angle functions from vector math library.
Same as acos(u.dot(v))
Fixed text so looks right
Voronoi2D and Delaunay Triangulation

For testing purposes. Voronoi2D needs polygon output and Delaunay needs
edges.
Menu updates

Removes CircleSort. Found another bug.
Add Voronoi2D and Delaunay
cleanup
Version info

We should find a better solution for this.
Text change

Removed function added by mistake