Consolidated PR and CRAN update

[klaukh]

@jcheng5, I realize you're quite busy with other projects and... per the note on the repo... are not actively maintaining this package. I'm curious if there's a path forward for incorporating updates and fixes, either through an en masse PR via another fork or through adding additional maintainers. As a starter, I've been steadily perusing through the network, PRs, and issues and incorporating many of the primary ones - color labels, NA values, axis positioning, d3 version protection - plus new features like a new API plus a shiny gadget. I would offer a comprehensive PR - with an eye towards a new CRAN submission - but want to first check to see what thoughts you might have. I'm partial to this heatmap implementation for performance and aethestic reasons, as I know others are as well, so would like to see if there's a path forward.

WIth all that said: thoughts / recommendations?

[jcheng5]

Sure, that'd be great!

[klaukh]

Cool. I'll start the cataloging and polishing then intiate the PR.

[klaukh]

@jcheng5 The PR is up... #86. Not being pushy, just want to make sure it reaches your inbox.