Author: Andrew Nicols
MDL-52051 repository_dropbox: Add the V2 API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a107243c6177d57054a03d77fe8832782830e498
http://github.com/moodle/moodle/commit/a107243c6177d57054a03d77fe8832782830e498
+ 3.0 en [usev2api,repository_dropbox]
+ 3.0 en [uselegacyapi,repository_dropbox]
+ 3.0 en [legacyapihelpsupported,repository_dropbox]
+ 3.0 en [oauth2redirecturi,repository_dropbox]
+ 3.0 en [oauth2title,repository_dropbox]