Touchdown

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- Fix creating dummy metric.

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- Fix alarm changes not applying and fix finding alarms when dimensions are involved.

- Wait longer to copy AMI's between regions.

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- Stop network ACLs applying every time

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- Add support for ICMP in Network ACLs

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- Add support for CloudTrail.

- Add support for CloudWatch Alarms.

- Add support for auto scaling policies.

- Override waiters for cloudfront. Double the amount of time we will wait for a
distributiion to be 'Deployed' as 25 is too low in practice.

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- More graceful handling of KeyboardInterrupt.

- Fix cache corruption issue.

- Workaround some potential eventual consitency issues with RouteTable and
NetworkACL. Observed behaviour is that after creating them they arent visible
to the describe API. Then they are. Then they arent. Then they are.

- Fix the Windows version of the local provider by runnign the bundle under an
interpreter.