got delete experiment command working

RELEASE_NOTES.txt

@@ -2,11 +2,12 @@ Release 1.3 (05/XX/2017)
 =============================
 
 - Added APIs and CLIs to update experiment attributes and metadata
-  catalog
+  catalog, as well as to delete experiments
   - New commands:
     * update-experiment
     * update-experiment-files
     * get-async-update-status
+    * delete-experiment
 
 Release 1.2 (04/18/2017)
 =============================