Merge branch 'hotfix-0.95.5' into develop
Provide a group-name filter to get_all_security_groups() call.

This uses a helper method provided by starcluster instead of directly
calling the boto method.
Merge pull request #401 from mindprince/minor-improvement

Provide a group-name filter to get_all_security_groups() call.
add support for t2 instance types
Merge pull request #407 from rayrayson/develop

add support for t2 instance types
Merge branch 'origin-develop' into mod-barp