Glossary term attributes are preserved

like emphasis and MathML
Updated index selector because title attribute seems to have disappeared
MathML revisions
Merge pull request #62 from Connexions/glossary-markup

Glossary markup and multicolumn index
Preserve id's in glossary terms so links in the index point to them
Merge pull request #63 from Connexions/glossary-index-terms

Preserve id's in glossary terms so links in the index point to them
Merge branch 'master' into slicer-staging