Release/2.9: Remove jsmath

Based on Issue #274 I've removed the jsmath files from htdocs.  The jsmath option hasn't been included in any of the config files for a while. 

After thinking about it I decided against trying to through and purge jsmath from the code.  It seems like that could potential cause more issues than it would help.  Opinions on this?  Anything else that needs to be done?  The documentation for release/2.9 needs to be changed to reflect the fact that you dont have to expand the jsMath files (and so does Jason's install script).