JCLOUDS-457: Created the skeleton of the Glacier API.
JCLOUDS-457: Added vault operations to the Glacier client. Now we should be able to create, delete, read and list vaults.
JCLOUDS-457: Added deleteArchive and uploadArchive operations to the Glacier client.
JCLOUDS-457: Added initiateMultipartUpload and uploadPart operations to the Glacier client.
JCLOUDS-457: Added completeMultipartUpload and abortMultipartUpload operations to the Glacier client.
JCLOUDS-457: Added listParts and listMultipartUploads operations to the Glacier client.