Footnote links

<h2>Summary</h2>
+ defined more specific selector to hide sup a's in titles in base (allows sup a's to pass through for footnotes)
+ removed 2 column specific CSS rules from .x-column-count 


<h3>Regression Testing</h3>
+ recompiled bio/physics/soc .css
+ Biology: http://naginata.cnx.rice.edu:9090/content/col10001/latest/pdf
+ Sociology: http://naginata.cnx.rice.edu:9090/content/col10004/latest/pdf
+ Physic http://naginata.cnx.rice.edu:9090/content/col10003/latest/pdf
+ Also regenerated entire sociology/physics pdf's off dev branch and diffed with control .pdf's