Add jupyter API var removed on accident

jiocontents/jiocontents.js

@@ -198,5 +198,10 @@ define(function(require) {
       return this.get(path, {type: 'directory'});
     };
     
+
+    var Contents = function(options) {
+         this.base_url = options.base_url;
+     };
+    
     return {'Contents': Contents};
 });
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