encode more vulgar fractions: 1/3 1/5 1/6 1/8 2/3 2/5 3/5 3/8 4/5 5/6 5/8 7/8
- do NOT encode 1/7 1/9 1/10 0/3 since the Helvetica Light font lacks them
vulgar fraction support: don't convert n/m if followed or preceded by '/'; fix inverted logic of NO_PSEUDO_LINK_PROTOCOLS; get rid of 1/4th and 3/4ths smarty conversions
change default <sup> and <sub> line height to 0, to keep lines aligned
re-enable pseudo-links; add new pseudo-link of type frac: which formats a vulgar fraction, splitting on the first '/', and emitting two spans, separated by a &frasl; fraction slash
Merge branch 'master' of github.com:poulsbo/discount