Ashutosh / Yahya - Added Create Customer Gateway for AWS VPC VPN. Adding enhancement as specified here : https://github.com/hashicorp/terraform/issues/551
Ashutosh / Yahya - Added Describe Customer Gateway for AWS VPC VPN. Ran go-fmt for files.  Adding enhancement as specified here : https://github.com/hashicorp/terraform/issues/551
Ashutosh / Yahya - Added Delete Customer Gateway for AWS VPC VPN. Ran go-fmt for files.  Adding enhancement as specified here : https://github.com/hashicorp/terraform/issues/551