more rubust handling of eslint config

package.json

@@ -62,7 +62,7 @@
         "c9.ide.language.html.diff": "#24f3608d26",
         "c9.ide.language.javascript": "#d1a479805c",
         "c9.ide.language.javascript.immediate": "#c8b1e5767a",
-        "c9.ide.language.javascript.eslint": "#3c57ed1720",
+        "c9.ide.language.javascript.eslint": "#4de5457db1",
         "c9.ide.language.javascript.tern": "#b55d0069bb",
         "c9.ide.language.javascript.infer": "#325ac6880e",
         "c9.ide.language.jsonalyzer": "#4b329741b1",