[About] Use timestamp, build number

Use timestamp and build number (as filterable properties) in
the built core bundle. WTD-699.

platform/core/bundle.json

@@ -7,13 +7,19 @@
             {
                 "name": "Open MCT Web",
                 "value": "${project.version}",
-                "priority": 1000
+                "priority": 999
             },
             {
                 "name": "Built",
-                "value": "YYYY-MM-DDTHH:MM:ssZ",
+                "value": "${timestamp}",
                 "description": "The date on which this version of the client was built.",
                 "priority": 990
+            },
+            {
+                "name": "Revision",
+                "value": "${buildNumber}",
+                "description": "A unique revision identifier for the client sources.",
+                "priority": 995
             }
         ],
         "components": [