Gets the list of snapshot identifiers for a specified document.
GET /documents/<documentID>/snapshots
Response type: application/xml or application/json
Response body: the list of snapshot IDs for the document. The id attribute of <snaphot> is the snapshot identifier.
GET /documents/8022/snapshots
<snapshots maxStackSize="10"> <snapshot id="we00000000d447acb133a0"/> <snapshot id="we00000000e5df6062ca2a"/> <snapshot id="we00010000dc73921d7b5d"/> </snapshots>