Adding <span>s around indexterms for semantic inflection and CSS styling.
Merge pull request #122 from oreillymedia/indexterms

Adding <spans> around index terms
Merge commit 'b896f1dbe7404d34d9deee730abda04bfbcb8fee'

* commit 'b896f1dbe7404d34d9deee730abda04bfbcb8fee':
  Adding <span>s around indexterms for semantic inflection and CSS styling.