- dialog confirm delete item

- fix: context-menu (right click) declared only once and using twice using:
  @click.native="$refs.popover.$refs.popup.show()"

src/plugins/dialog.js

@@ -0,0 +1,5 @@
+import Dialog from 'quasar'
+
+export default ({ Vue }) => {
+  Vue.use(Dialog)
+}