JCLOUDS-457: Added initiateJob

Now the Glacier client supports the initiateJob operation.
JCLOUDS-457: Added describeJob operation

Now Glacier client supports the describeJob operation.
JCLOUDS-457: Added listJobs operation

Now the Glacier client supports the listJobs operation.
JCLOUDS-457: Added the retrieve output operations

Now the Glacier client can retrieve data.