Add ability to list all internet gateways across an account.  Ref #418
Add method to delete internet gateway by Id

Ref #734
Add method to support looking up subnet by id rather than network id

Ref #738
changes to get a single autoscaling policy by name

Ref #743
Merge pull request #12 from TheWeatherCompany/added-volumes-to-vms

Added volumes to VirtualMachine for basic volume info when retrieving a ...
Merge pull request #13 from TheWeatherCompany/twc_dev

Twc dev