Fix ie8

* disable parallax if media query is not supported
* close <path> tag explicitly so ie8 can deal with it
* add a ie8 style sheet
* added png's of logos since ie8 doesn't support svg

I did have trouble on the sessions page. For some reason, that header is not picking up the css. I'd like another pair of eyes because I've been up for 24+ hours.
good catch, no, I meant to move it to the bottom of the body.