Add mobile push API
Add unit tests for publish operation
Add target_arn to publish method in SNS client
Enable connect_to_region('us-gov-west-1') for all services in GovCloud

added region information to the __init__.py for each service

additional updates supporting govcloud functionality:
- update auth.py HmacAuthV4Handler to return the correct region name
- update iam/connection.py to return the correct IAM signin url for govcloud
Updated Redshift for ``copy_cluster_snapshot/delete_cluster_snapshot`` changes.
add unit test coverage for HmacAuthV4Handler.credential_scope()

validate two existing use cases with iam.amazonaws.com and
iam.us-gov.amazonaws.com as well as the potential use case of
iam.<some-region>.amazonaws.com with the non-existant
iam.us-west-1.amazonaws.com
Add db_subnet_group to restore_dbinstance_from_point_in_time
Enable connect_to_region(us-gov-west-1) for vpc services in GovCloud
Moved EMR to SigV4.
Updated SNS docs.
Merge branch 'emr-sigv4' into develop
Merge branch 'redshift-updates' into develop
Merge branch 'sns-mobile-push' into develop
Added release notes for v2.10.0.
Bumping version to 2.10.0
Merge branch 'release-2.10.0' into develop

* release-2.10.0:
  Bumping version to 2.10.0
Bugfix: s/LastUpdatedTimestamp/LastUpdatedTime

The cloudformation api is returning xml that does not have
LastUpdatedTimestamp elements, but rather LastUpdatedTime elements. Here
is an example:

<ListStacksResponse xmlns="http://cloudformation.amazonaws.com/doc/2010-05-15/">
  <ListStacksResult>
    <StackSummaries>

...snip

      <member>
      <StackId>STACKY_DOO_DAH</StackId>
      <StackStatus>UPDATE_COMPLETE</StackStatus>
==>   <LastUpdatedTime>2013-08-09T18:58:22Z</LastUpdatedTime>
      <StackName>StackyDooDah</StackName>
      <CreationTime>2013-08-09T15:18:49Z</CreationTime>
      <TemplateDescription>juggernauts</TemplateDescription>
      <StackStatusReason/>
      </member>

This commit fixes this and adjusts a couple of tests accordingly.
updated the connection to use boto.dynamodb2.connect_to_region
Conflicts:
	docs/source/dynamodb2_tut.rst
Merge remote-tracking branch 'carllen/connect_to_region_us-gov-west-1' into develop
Correctly fetch VPC instances from SG.

Use filters to fetch the instances.