Add support for Route Table tagging
Support instance security group/groupSet attribute modification and description
Update upstream branch 'master' into instance_modify_security_groups
Merge pull request #270 from tsanders/instance_modify_security_groups

Add support for instance "groupSet" attribute modification and description.  Support for Route Table tagging.
Start to add basic support for dynamodb2 item updating. Closes #16.
Add proper SNS paging. Closes #144, #145.
Add @gary-dalton to authors.
Add compat file for Py26 OrderedDict.
Cleanup build matrix. Closes #213.
Remove py3.4 for now.
Cleanup some incorrect date formats.