Author: Victor Deniz
MDL-62320 mimetypes: Add JSON to the default mime types list
http://git.moodle.org/gw?p=moodle.git;a=commit;h=046dd892c72939dff960d3e2c9e016f098966306
http://github.com/moodle/moodle/commit/046dd892c72939dff960d3e2c9e016f098966306
+ 3.6 en [application/json,core_mimetypes]