Legend tweaks

Legend tweaks

Make casing consistent
Update README with some ToDos
Fix tooltip locations

They were showing up on top of the nodes instead of beside. Seems like
I did this before...
Mobile layout coordinate system
Mobile layout coordinate system
Fix tooltips on mobile

Previously they were being cut off on the right side
Fix tooltips on mobile

Previously they were being cut off on the right side
Update README

With publication info and notes
Update README
Moved mobile layout setup for consistency with master
Fix some minor syntax issues
IE 8 fallback to screenshot

The <a href="https://github.com/mhemesath/r2d3/">r2d3.js</a> library
_almost_ worked perfectly, but the labels were not showing up (tried
using x and y instead of dx and dy as noted in the docs but that didn't
work) and the tooltips wouldn't move for some reason (probably easier
to fix).
Merge in IE 8 fallback