Add Dropbox Support

[ademers]

Add Dropbox support to allow syncing of backups to a specified Dropbox account.

Similar to the current Amazon S3 support as described at: https://github.com/nystudio107/craft-scripts#sync_backups_to_s3sh.

[khalwat]

Such a thing exists: https://github.com/dropbox/dbxcli

I don't use Dropbox tho, so I have no way to test. Would be awesome if someone did it.

[connor-baer]

@ademers Are you going to try this? Otherwise I might give it a shot.

[ademers]

@connor-baer I don't think my programming skills are sufficient for me to be able to do this in a timely manner, so please go ahead. Also, @selvinortiz mentioned in Craft Slack that he may be interested in tackling this enhancement.

[connor-baer]

@ademers I've submitted a pull request (#10) already, just waiting for @khalwat to accept it. 😊

[khalwat]

Awesome, thank you @connor-baer -- having a look