updated color.py

bug fix for blending and addition of rgba8888 method

abs of a vector should be its length, fixed

100% test coverage because I can

improved test coverage. Changed Color.copy to a property to be consistent with the vector types.

updated documentation for renaming of Vector to V2

added tests for 3D vector

added 3D vector type (V3) and renamed Vector to V2

added Color.copy to align with the Vector class better and Color.uint32 for interfacing with platform code. Also added a setter for hue to support easier hue modification in-place.

Exposing Rectangle

Merge branch 'master' of https://github.com/Steven-Wilson/gfxutils

major update

correct mistake in documentation

lifted things into package-level namespace

added more documentation