Frontend functionality for direct S3 image uploads
Modify paperclip config to allow S3 bucket in development when AWS_BUCKET is defined
Transfer Photo direct upload file to final paperclip destination (no queue)
Transfer Photo direct upload photos asynchronously
Add the use of .env file for configuration in development environment
Add ability to switch between classic and s3 uploader

If s3 is not available, default to using the classic method and do not give
the option to use the s3 (default) uploader.
Add tests for Photo#direct_upload_url transfer
Do not allow application submissions while images are being uploaded
Implement direct upload to S3 for submission images. Closes #126.

Merge branch 's3_upload'

* s3_upload:
  Do not allow application submissions while images are being uploaded
  Add tests for Photo#direct_upload_url transfer
  Add ability to switch between classic and s3 uploader
  Add the use of .env file for configuration in development environment
  Transfer Photo direct upload photos asynchronously
  Transfer Photo direct upload file to final paperclip destination (no queue)
  Modify paperclip config to allow S3 bucket in development when AWS_BUCKET is defined
  Frontend functionality for direct S3 image uploads
Fix locale links in footer to include existing GET params