allow the notebook to run without MathJax...
allow the notebook to run without MathJax
* add `--no-mathjax` flag for disabling mathjax in the notebook server
* A jQuery dialog with our 'no mathjax' message will appear if mathjax is unavailable, but the notebook will be fully functional after dismissal.
* Various calls to MathJax.Hub.typeset moved to Cell.typeset, which checks for MathJax existence and is a no-op without it.
closes
#1071