Branch for reading from / writing to / backing up to / restoring from Amazon S3, refs #4260
configuration for Amazon S3
Net::Amazon::S3 and dependencies
Amazon S3 download storage module
replace class variables with instance variables
Merge branch 'master' into amazon_s3

Conflicts:
	carton.lock
	mediawords.yml.dist
added https://github.com/pypt/gridfs-to-s3 as a submodule + helper script's CPAN dependencies
updated gridfs-to-s3
kill the temporary webserver right before running the test(s)
Merge branch 'master' into amazon_s3

Conflicts:
	cpanfile