call path.normalize on docId

package.json

@@ -70,7 +70,7 @@
         "c9.ide.language.javascript.infer": "#18acb93a3a",
         "c9.ide.language.jsonalyzer": "#d8183d84b4",
         "c9.ide.language.codeintel": "#e92ace1a56",
-        "c9.ide.collab": "#6e0f24df9a",
+        "c9.ide.collab": "#be6b8a3054",
         "c9.ide.local": "#10eb45842a",
         "c9.ide.find": "#e33fbaed2f",
         "c9.ide.find.infiles": "#c0a13737ef",