IE8 Compatibility

Adding support for IE8 with some helpful additional dependencies:

 * [component/bind](https://github.com/component/bind) for `Function#bind` support
 * [component/map](https://github.com/component/map) for `Array#map` support
 * [yields/empty](https://github.com/yields/empty) to correct a bug IE8 has with `innerHTML` on table-related elements
 * [stephenmathieson/normalize](https://github.com/stephenmathieson/normalize) to help normalize the event-handlers (`target`, `preventDefault`)

I'll leave this open for a few days to allow others to review it, but I've gotten the example page working correctly in IE8, and I imagine it will be useful to others.