convenience method to get collection from cursor

Author: agirbal

src/main/com/mongodb/DBCursor.java

@@ -637,6 +637,14 @@ public DBObject getQuery(){
         return _query;
     }
 
+    /**
+     * gets the collection
+     * @return
+     */
+    public DBCollection getCollection(){
+        return _collection;
+    }
+
     // ----  query setup ----
     private final DBCollection _collection;
     private final DBObject _query;