Move IE8 shims and fixes so they load after styles

For respond.js to work correctly, it must load after the CSS has loaded (it uses media queries in the CSS files to determine styles to display).

Also, from the docs, “Reference the respond.min.js script (1kb min/gzipped) after all of your CSS (the earlier it runs, the greater chance IE users will not see a flash of un-media'd content)”

Before:
![screen shot 2014-06-26 at 09 07 33](https://cloud.githubusercontent.com/assets/319055/3396108/20f4e0a0-fd09-11e3-9cb9-cb40f112a1ad.png)

After:
![screen shot 2014-06-26 at 09 07 53](https://cloud.githubusercontent.com/assets/319055/3396112/277d3b3e-fd09-11e3-9c35-5cb420afd0bd.png)