Added public IP in VPC support to EC2.
Switched SWF over to SigV4.
Merge branch 'ec2-public-ip-vpc' into develop
Merge branch 'swf-sigv4' into develop
Added release notes for v2.11.0.
Bumping version to 2.11.0
Merge branch 'release-2.11.0' into develop

* release-2.11.0:
  Bumping version to 2.11.0