UI Updates, Dots, Tooltips

Should be safe to merge in, and delete the ui-updates branch. Just a few changes:

* Toned down the depressing halloween vibe
* Moved the nav to the header. Still not perfect, but I'll fix it up at some point.
* Dots!
* Hover over the dots for a tooltip!
* CSS refactoring. Also removed unnecessary legacy browser support and a bunch of unneeded styles.

Future work:

* Figure out what to do with the dots when there's a couple weeks' worth of data
* Clean up the graph labels and scales. i.e., the graph range should be 40–70%, rather than 43.2–63.7%.
* Double check browser support.

![screenshot!!!!](http://f.cl.ly/items/3r0V1T162g3p3r3g2L0r/Screen%20Shot%202013-06-04%20at%207.50.27%20PM.png)