Author: Damyon Wiese
MDL-58128 googledocs: Support reference files.
Add options so the admin can control the types of files this repository can support (and the default).
Part of MDL-58220
http://git.moodle.org/gw?p=moodle.git;a=commit;h=989e14fea094672b401f5dcf3d3071d70573ae32
http://github.com/moodle/moodle/commit/989e14fea094672b401f5dcf3d3071d70573ae32
+ 3.3 en [internal,repository_googledocs]
+ 3.3 en [external,repository_googledocs]
+ 3.3 en [both,repository_googledocs]
+ 3.3 en [supportedreturntypes,repository_googledocs]
+ 3.3 en [defaultreturntype,repository_googledocs]
+ 3.3 en [fileoptions,repository_googledocs]