Restart server if it no longer runs

This can happen when a collaborator was running it and left,
in which case we don't get the "exit" event

package.json

@@ -90,7 +90,7 @@
         "c9.ide.imgeditor": "#612e75ef4f",
         "c9.ide.immediate": "#a962119bec",
         "c9.ide.installer": "#0fde9f0067",
-        "c9.ide.language.python": "#1b88268f0e",
+        "c9.ide.language.python": "#04a482eb3a",
         "c9.ide.mount": "#b9a5a2d45c",
         "c9.ide.navigate": "#38ae100ea1",
         "c9.ide.newresource": "#981a408a7b",