Support uploading multiple files at once in the upload tab ad support Multiple revisions for the one file

The new feature requests are for the Upload Tab in Crucible Review:

1. Allows the ability to upload multiple files to a review at once in the upload tab (i.e. add file to review, then file to diff. Then another file to review and another file to diff, without having to do them one at a time).
2. Support multiple revisions/iterations (i.e. multiple upload) so that the revision slider works for a file. (If the file has the same path, then it should be added as a new version.

A customer has made the suggestion:

1. Add the ability to put in a directory instead. I.e. "Directory to review", "Directory to diff with", so that you can upload multiple files at once.