Add `script_env` support to EC2
Add `script_env` support to Digital Ocean
Add `script_env` support to GoGrid
Add `script_env` support to IBMSCE
Add `script_env` support to Joyent
Add `script_env` support to Libcloud AWS
Add `script_env` support to Linode
Add `script_env` support to Openstack
Add `script_env` support to Parallels
Add `script_env` support to Rackspace
Add `script_env` support to Saltify