added centroid method int Arc and in ArcTween
removed Lines class and added a smoke test for RadialLine
Merge pull request #88 from ericcitaire/master

Update Getting Started section
Update README.md
Update README.md
updated OrdinalScale tests
Added index in format function
Removed saucelabs deps
Added Nest and Nest function objects
Merge pull request #94 from gwtd3/arc_svg

added centroid method int Arc and in ArcTween
removed testarc
remoed test arc
Merge pull request #95 from gwtd3/svg_lineradial

removed Lines class and added a smoke test for RadialLine
upgraded to 3.3.9
finish DiagonalRadial (added Cluster Dendogram demo), and refactor
Layout API
license header
Added SVG chord class
Added drag.origin(datumfunction) variant
added doc on drag.origin
Merge branch 'svg_diagonal'