allow numbers as well as alpha between underscores
Correctly convert elements with trailing whitespace to LaTeX
some initial attempts at repeating footnotes
repeated footnote test case, and HTML output
update docs to reflect that footnotes can be repeated
fix repeated ID's in html output with repeated footnote markers by incrementing a repeat counter
Fixed typo in pulled commit
Added multiple backlinks for repeated footnotes
Use the acronym package for abbreviations in the LaTeX convertor.
Fixed two problems with acronym patch

* acronym key may only contain ASCII characters
* escape special LaTeX characters in acronym def
LaTeX compilation tests are now done in a new directory to avoid problems with texput.aux
New smart quote rule for correctly parsing emphasis inside quotes
Updated release notes, version and homepage
Updated styling
Added sponsor message
Added missing name in release notes