new jQuery version and logo padding tweaks for smaller screen sizes

Bumping to a much newer version of jQuery.  I added some media queries to tweak the padding-right on #tabzilla (the Mozilla logo and dropdown link) to position it better on smaller screen sizes and instead of being scrunched up to the left it's all more centered.

I tested the changes on latest Firefox, Chrome, and Safari releases.  I don't have IE available on this machine.