Start jenks
Merge branch 'master' into jenks
Work on Jenks.
Add confirmed sample variance test
More tests, these based off of numpy
Add gvf and jenks dynamic tests
Gah, dynamic programming example is so cryptic
Fix jenks dynamic impl
Rename jenksDynamic to jenks since this is the original formula.

Comments and better variable names. Refactor out matrices.
Changelog, remove mixin
Bump version
Merge pull request #24 from tmcw/jenks

Jenks