Windows Rendering Issues

There were some problems with scrollbars being added around the sidebar in Windows browsers (these scrollbars are completely missing from these browsers' OS X counterparts).  See the screenshots below--

Chrome: http://puu.sh/59NdU.png
IE: http://puu.sh/59Ni6.png
Firefox: http://puu.sh/59NiL.png

Adjusted the entire sidebar to be affixed, changed the child col class accordingly, and added a 2-column offset to the main content region to account for the removal of the sidebar from page flow.  This fixes the bug in the Windows browsers while maintaining the present appearance in elsewhere.