Added in tooltips to the popChart. Also changed denom to be based on ant...

Cleaned up the coffeescript to be more in line with the d3 example code published by Bostock. 

Added in popovers on the populationChart. This required use of the ```{container: 'body'}``` because, by default, Bootstrap wants to use the element's parent and there was a problem with popover and svg not playing nicely. We can move this to another element if that would be preferred.  

Changed the numerator bar to be scaled based on the antinumerator data rather than the DENOM data to make the chart make more sense.