Create signed URLs in SubmissionFilesController.
Add jQueryFileUpload files.
Add S3_direct_upload gem.
Working on direct uploads to S3.
Fix JS for multiple uploads.
Working uploads + access.
Show uploaded documents.
Remove jQueryFileUpload code. Handle failed uploads.
Keep updated list of uploaded files.
Create S3File module for URLs and paths.
Add S3Uploader to all forms with file uploads.
Remove unused include.