removes snapshot restore first pass.
removes snapshot restore first pass.
Adds new spaceExists() and contentExists() methods to the store client. Updates several places in DurAdmin to use these calls, including when looking for snapshot properties and when looking for a logo. Also updates the REST calls in DuraStore to handle not found responses slightly differently. The purpose of all of this is to reduce the amount of unnecessary error logging that was caused by checks to see if files existed.
Updates list snapshots task to be furnished a host value (to pass down to the bridge) on init rather than requiring the value be passed in.
Allows the restore task runner to expect a 201 response rather than 200.
adds snapshot panel and snapshots to space listing.
Adds the snapshots to the space list in duradmin.  Also adds the ability to select a snapshot and view the snapshot details. The snapshot restore button is not yet implemented.
Merge branch 'feature/snapshot-restore-interface' into develop

Conflicts:
	duradmin/src/main/java/org/duracloud/duradmin/spaces/controller/SnapshotController.java