add support for sts get_federation_token
add unit tests for get_federation_token
test which verifies authorizing rules within a VPC is broken see issue #108
We're getting back the correct group from get_security_group_from_id,
but hitting another issue with the source_group_name also using an id
rather than a name
VPC support for adding rules improving
fix for VPC revoking of rules related to groups
fix querystring handling in get_federation_token
remove whitespace in sample responses in STS get_federation_token response
support x-amz-copy-source in multipart uploads
Merge pull request #107 from kouk/stsfederation

STS get_federation_token support
Merge pull request #110 from kouk/multipart-copy

support x-amz-copy-source in multipart uploads
removed unnecessary itertools chain.
added success test case around authorize & revoke
Merge pull request #109 from StartTheShift/fix_vpc_grant_permission_issue

Fix vpc grant permission to groups issue
0.2.20
Add ability to launch instances with security groups.
Fix bug with POST uploads returning 400 client error
support replacing key metadata when copying
Merge pull request #114 from joerick/fix-post

Fix bug with POST uploads returning 400 client error
when copying keys create new objects using deepcopy
support reduced redundancy storage