Allowed boto to register hvm instances
PEP8 fixes
Add unit tests for register_image with both normal and hvm virtualization types.
Fix the ability to override DynamoDBv2 host when creating connections
Add a simple test to make sure host and port get properly set in the constructor
Merge pull request #1733 from danielgtaylor/amiato-master

Allowed boto to register hvm instances. Fixes #1733, #1726.
Removed Content-Encoding from the metadata test.
Merge pull request #1735 from reinhillmann/develop

Removed Content-Encoding from the metadata test.
Merge pull request #1734 from danielgtaylor/ddb-host

Fix DynamoDB host override. Fixes #1734, #1732.
Added support for the ReplaceRouteTableAssociation in response to issue #1727
Merge pull request #1736 from carsongee/ReplaceRouteTableAssociation

Added support for the ReplaceRouteTableAssociation. Fixes #1736, #1727.
Cosmetic: whitespace fixes