Small, strictly textual corrections.

Is the version info in collective/mathjax/profiles/default/metadata.xml
irrelevant, or for a different purpose? Plone recognizes 1.1.1 ...
Copy the present profile "default" to "online"

I don't know (yet) how to use different profiles, but one might want to
switch, so I take this into account.
v1.2; register local copy (untested)
ignore *~ backup files (Vim)
Map resources/MathJax/ to /++resource++mathjax/
Updated from mathjax-MathJax-v2.3-9-g78ea6af.zip
Not part of MathJax 2.3 archive
Updated documentation
Edit (or view) collective.mathjax.egg-info/PKG-INFO as well
remove comment line
Version 1.2.1; "online" profile