[GM] adding support for pushing documents to Amazon S3
[GM] Adding document upload to S3 from page 6
[GM] Added file upload to other pages
[GM] Failed uploads to S3 result in validation error
Merge remote-tracking branch 'origin/master' into adding-s3-upload

Conflicts:
	app/controllers/Page7.java
	conf/messages
Add logging of S3 file uploads

We don't do a lot of logging from SSP, but it would be good to have proper error logs for file uploads in case of problems.
Merge pull request #79 from alphagov/adding-s3-upload

Adding s3 upload