As a user, I can drag'n drop files to upload in a pending transfer

As a user, I can drag'n drop files to upload in a pending transfer in the 'Upload to Nuxeo' tab. A drop zone is defined bellow the box containing the metadata of the transfer document.

I can drop as many files as I want and as soon as I drop them, their are uploaded via the Aspera Connector.

The listing contains only batch file metadata: index, filename without transfer status informations.

AC:

• I can drag'n drop a file or a bunch of files in the drop-zone area and the upload is started
• I can select a file using the Aspera Connect and the upload is started
• I can see all the uploaded (or in progress) files on the UI in a list and the list is persisted