Full support for all AWS Availability Zones

This commit allows beeswithmachineguns to operate properly in AWS regions besides N. Virginia. The `boto` library is simply configured to speak to the appropriate region in order to allow:

- Launching of Private AMIs in other regions
- Querying (via `report`) of instances running in other regions

Additionally, the `boto` library version has been bumped to a more recent 2.7 version which works great with BWMG.