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=6945d524c8401d5ec86d9872aacff4e469389c1c
http://github.com/moodle/moodle/commit/6945d524c8401d5ec86d9872aacff4e469389c1c
+ 2.1 en [instruction,repository_dropbox]