Author: Damyon Wiese
MDL-43856 MathJax: Add a setting for additional delimiters to support e.g. ASCIIMATH
http://git.moodle.org/gw?p=moodle.git;a=commit;h=894e20395d3a91d8a015c7f631c6d27e765dd315
http://github.com/moodle/moodle/commit/894e20395d3a91d8a015c7f631c6d27e765dd315
+ 2.7 en [additionaldelimiters,filter_mathjaxloader]
+ 2.7 en [additionaldelimiters_help,filter_mathjaxloader]