Author: Jerome Mouneyrac
MDL-27551 add enable mobile feature (enable web services + mobile service - add mobile builtin service - add unique shortname for service)
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c1b658832df8df2c2c7e408efecf21bd92d5e268
http://github.com/moodle/moodle/commit/c1b658832df8df2c2c7e408efecf21bd92d5e268