Author: Tim Barker
MDL-33476 repositories: Added instructions to assist with setting up Dropbox keys
http://git.moodle.org/gw?p=moodle.git;a=commit;h=db181b6a147d8e84f3f91ba7cf002f341e277f68
http://github.com/moodle/moodle/commit/db181b6a147d8e84f3f91ba7cf002f341e277f68
+ 2.2 en [instruction,repository_dropbox]