[mmell] -- -- Incorporated the review comments provided by mike on previous PR

@mmell 
-- Added README Snapshots
-- Added RAKE task changes
-- Added cronjob changes
@sachingade20 make region the final arg in **all** tasks. The ` => [:region]` command calls this method https://github.com/brightbytes/aws-sdk-core-ruby-rake/blob/master/lib/tasks/aws.rake#L49