should use MathJax.Hub.Queue() instead of .Typeset(): finally solved the mysterious race condition issue

http://docs.mathjax.org/en/latest/typeset.html
bump version
Do typeset mathjax on initial load

Fixes initial load not being typeset on e.g.:
https://gist.github.com/jcheng5/a0d123d58737590ac21e
Fix roxygen
do not ignore the names of choices data
Remove Rmd examples
Merge branch 'master' of https://github.com/rstudio/shiny