Added EBS snapshot changes

@mmell 
https://trello.com/c/XDCFeDX2/75-cnc-should-perform-ebs-snapshots
@cjawale Maybe this entire gem is misnamed. For example, how about:
|- CloudSnapshots
|-- Aws
|--- Ebs
|--- Ec2

I'm not saying that is right, but something is off about this.