fix jQuery global window namespace registration

loginWindow is spawned with nodeIntegration set to True. Since
loginWindow will always be reaching out to external servers, we
can set nodeIntegration to False to prevent the 'module' global
namespace variable from being set.

electron/electron#254

src/main.coffee

@@ -128,6 +128,9 @@ app.on 'ready', ->
             "min-height": 420
             icon: path.join __dirname, 'icons', 'icon.png'
             show: true
+            webPreferences: {
+                nodeIntegration: false
+            }
         }
         mainWindow.hide()
         loginWindow.focus()