document usage from ruby / rake

[nkuehn]

Our Use case: deploy a Jekyll generated site to S3

For that it would be cleaner to call the Sync command directly as Ruby code in the Rakefile instead of running the shell command s3sync from the Rakefile. Probably via the SyncCommand class.

Is that possible? Would be great to document it in the README if supported.

PS: the README could profit from a clarification what disc.company.com is. "Remote Node" seems to be language derived from the s3sync internals, may be better to use "bucket" and "object path" in AWS lingo.