Feature/fog provider aws support

This is the first version of AWS support for the `fog_provider` plugin. For EC2 classic, you must specify the security_groups under Advanced (use default, if you don't know). For VPC, you must specify the security_group_ids, subnet_id, and allocate_public_ip under Advanced. Fixes #22 
Nope, not a mistake. That will convert it to a boolean.