Added Variance and Corrected Standard Deviation to core array functions.
renamed sd to deviation #1073
added exit criteria for variance that returns NaN on an empty array
refactored results with NaN array and empty arrays to fit the results of R
using an evaulation array for accessor functions and ignoring NaN, undefined and null
Limit charge distance.
Optimize charge calculation.
Update tests
Why are there conflicts
Implement monotone chain convex hull (faster and cleaner)
Merge branch 'better-hull2' of github.com:GoldyOrNugget/d3 into better-hull2
Clean up sort comparator
More comments
Add a few more tests
Remove accidental global vars
Add compiled files
Merge branch 'master' into better-hull2
Implement a bunch of RNG tests including K-S test
Remove console.logs and add more comments
Remove unused code