Merge pull request #62 from inconshreveable/master

add head method
rds: initial
aws: Adding Route53 endpoint
rds: break out address and port
route53: Initial commit
rds: a,b,c

cc/ @mitchellh
rds: add skip final snapshot
route53: Testing delete hosted zone
route53: refactor helper
route53: support get hosted zone
route53: GetChange support
rds: skip final snapshot
rds: add dbsecuritygroupnames
route53: Fixed XML encoding
rds: add db security group functionality
rds: add AuthorizeDBSecurityGroupIngress
rds: dbsecuritygroup statuses
route53: Support resource records
route53: Added FQDN method
Implementation of Copy operation for S3 Buckets.

Copy documentation: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html