Move most game-specific logic to a new ra.js module.
Move more RA-specific code to ra.js
Only set up yScale on the first render.
Add more info to tooltip.
Improve tooltip rendering.
Add css arrow to tooltip.
Add more stuff to tooltips.
Improve unit hoverability.
Change build.js to ra2json.js and describe it in README
Layout/style changes so tooltips don't get cut off.
Fixes for Spy (missing unit.Tooltip).
Hacky fix for units that occupy the same point.
Split stylus into separate files.
Split chart js into a separate file.
Improve hoverability by adding a circle.hover for every unit.
First cut at a simple legend.
Merge branch 'master' into gh-pages