Initial support for DBSubnetGroup
_sign_string private_key_file can now be file-like

Distribution._sign_string is now a little bit more flexible, allowing
the private_key_file to be a file-like object (or really anything with a
.read() method).
Added support for block device mappings in autoscaling groups (re #753, #1343)
updat incorrect copyright
Add missing function parameter (re: #1357)
add integration test
cloudformation Stack DisableRollback is always True

Fix problem where DisableRollback is always true, because
bool("False") == True
Merge branch 'develop' of git://github.com/boto/boto into dbsubnetgroup
Added DkimTokens as a list marker.
Add MinAdjustmentType for autoscaling.

When policy_type is PercentChangeInCapacity, allows values of
min_adjustment_type, which set the AWS MinAdjustmentType value for
autoscaling policies.
Add mobile push API
Add unit tests for publish operation
Add target_arn to publish method in SNS client
Added public IP in VPC support to EC2.
Add support for no_proxy to HTTP connections

In addition to the http_proxy environment variable, most url
handlers support a no_proxy environment variable, containing a
comma-delimited list of domains to ignore.

Solves Issue #1600
Fix no_proxy support, add https support, add tests

This adds support for https, fixes a broken reference,
and adds two unit tests.

Solves Issue #1600
Remove extra whitespace
Cleanup no_proxy environment variable during tests
Merge branch 'release-2.9.8' into develop

* release-2.9.8:
  Bumping version to 2.9.8
Added failing tests for ``in`` on SQS ``MHMessage``.