Author: Juan Leyva
MDL-66775 tool_mobile: New force minimum app version setting
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4bf08f5b4dc24843c0398932e5278985c249d583
http://github.com/moodle/moodle/commit/4bf08f5b4dc24843c0398932e5278985c249d583
+ 3.8 en [minimumversion,tool_mobile]
+ 3.8 en [minimumversion_key,tool_mobile]