Deploy via aws sdk

@accardi /cc @bfulton @kbarrette 

This solves our immediate ListPipelines pagination problem, at the cost of temporarily requiring both Fog and aws-sdk.

See comment for more info: https://github.com/swipely/pipely/blob/963408f5b26045d1f145443e7e217a4a91b8b471/lib/pipely/deploy/client.rb#L1-L11