do not use tar --overwrite, since it doesn't work on mac

package.json

@@ -90,7 +90,7 @@
         "c9.ide.help.support": "#6bcfa8ceff",
         "c9.ide.imgeditor": "#ed89162aa7",
         "c9.ide.immediate": "#6845a93705",
-        "c9.ide.installer": "#dbfbb98527",
+        "c9.ide.installer": "#c36540bd61",
         "c9.ide.mount": "#250f8d91a2",
         "c9.ide.navigate": "#f358997d93",
         "c9.ide.newresource": "#f1f0624768",