Add "s3:logs" command

[aik099]

Since snapshot/preview releases are downloaded from s3 bucket directly it doesn't make sense to have application-level download log. Instead I've enabled S3 logs.

Need to add "s3:logs" command that would:

1. download & show logs
2. rotate them so that they don't take too much space in the bucket
3. for historical purposes track downloads of each version in separate table that would exist even after release is deleted

[aik099]

Apparently AWS itself is accessing buckets and that creates log records as well. I've disabled logging for now, but kept logs to be parsed once command is created.