Issue #415: Deleting files does work
Merge pull request #598 from aptik/2.x

Issue #415: Deleting files does work
fix (#597) ClientOption `dragUploadAllow`
[Driver.Dropbox] fix missing customData when return from dropbox.com
Merge branch 'dropbox' into 2.x_n
Merge branch '2.x' into 2.x_n