Moving to v15.3.1 of React & ReactDOM

Bumping version to 3.0.0 now that we have d3 v4 support

Version bump to 2.0.0

Fixing bug where tooltips would not show in Firefox (thanks @vjo)

Adding support for custom charts

Adding ability to show a legend for a PieChart

Fix bug where tooltips would not display if bootstrap.css was also in…

… use

Adding support for [email protected]

Fix bug where PieChart would not render paths correctly when adding n…

…ew values

Extend w/ React.Component to avoid warnings w/ [email protected]