Add support for use within AWS GovCloud

GovCloud does not have multiple zones (ATM) so I had to prevent the
_get_region method from stripping off the last character in the zone. I
got errors when setting the placement so I assume this parameter needs
to be ignored when in GovCloud. Last, boto needed to be upgraded in
order to support the new GovCloud region.
Merge branch 'govcloud_support' of https://github.com/jgrevich/beeswithmachineguns into jgrevich-govcloud_support

* 'govcloud_support' of https://github.com/jgrevich/beeswithmachineguns:
  Add support for use within AWS GovCloud

Conflicts:
	beeswithmachineguns/bees.py
Merge branch 'jgrevich-govcloud_support'

* jgrevich-govcloud_support:
  Add support for use within AWS GovCloud