Initial release of ddd command line tool

What's Changed

• Add support for using Azure storage by @johnbradley in #345
• Add ddd command line tool for Cloud Storage by @johnbradley in #350
• Update README replacing ddsclient with ddd by @johnbradley in #351

Full Changelog: 3.4.0...4.0.0

Enhanced upload checking

Changes upload command to check each file's download URL after uploading #343
Improves check command #341

Adds check command

Adds ddsclient check -p <projectName> command to verify that an uploaded project is in a consistent state.
Occasionally uploaded projects do not become consistent. This command will show the problematic files that can be deleted to fix consistency issues.
See PR #328

Delete files/folders and upload_file fix

Adds the ability to delete a single file/folder using the delete command: #320
Fix TypeError when using sdk DukeDS.upload_file method: #322

Config loading improvement

Improves error messaging when parsing the .ddsclient config file.
See #317 and #319

SDK OAuth token refreshing

See #314

python3 only release

Drops python2 support.
See #310

Fixes before dropping python2 support

• Improve error messaging for delivery command #299
• Show speed in upload progress #303
• DukeDS.create_folder developer sdk method #306
• Fixes for downloading #309

NOTE: This will be the last version of ddsclient that supports python2

Improve Downloading

Streamlines downloading to allow for downloading projects with 10K files.
These changes also reduce the memory requirements for downloading.
See #295

Delivery share user improvements

Auto registers share users and displays a warning when users try to share with invalid users.
See #299