* Volume: bug fixes/typos.  * status -> status_code / attachment_status_code  * instance_id for attachment requests should be the endpoint instance    id and not the Merlin instance id  * Fix logic with multiple EBS volume support / instance already being attached  * Logic error: availability_zone.nil?  * Make sure availability_zone is set correctly upon invocation
* Volume: bug fixes/typos.
 * status -> status_code / attachment_status_code
 * instance_id for attachment requests should be the endpoint instance
   id and not the Merlin instance id
 * Fix logic with multiple EBS volume support / instance already being attached
 * Logic error: availability_zone.nil?
 * Make sure availability_zone is set correctly upon invocation

baughj/Merlin,baughj/Merlin