Add icky multi-point support
Add icky multi-point support

Summary:
So much here that would be nicer if I can figure out how to make each
graph type into its own React component.

Reviewers: emily

Reviewed By: emily

Differential Revision: http://phabricator.khanacademy.org/D2759

huangins/perseus,learningequality/perseus,alexristich/perseus,iamchenxin/perseus,abe4mvp/perseus,chirilo/perseus,ariabuckles/perseus,junyiacademy/perseus,sachgits/perseus,daukantas/perseus,sachgits/perseus,alexristich/perseus,learningequality/perseus,ariabuckles/perseus,ariabuckles/perseus,huangins/perseus,abe4mvp/perseus,daukantas/perseus,ariabuckles/perseus,chirilo/perseus,iamchenxin/perseus,junyiacademy/perseus