footnote formatting

From the format guide (http://graduate.asu.edu/sites/default/files/GraduateEducationFormatManual.pdf):

"You must single-space individual footnotes and reference entries, then double-space 
between each note and entry. "


I'm not positive this fully complies with that requirement -  the definition of footnotesep may not be exact. If changes are required I'll file another pull request when I get hassled during format review.