feat(layout): add front-end application skeleton

refs #59

app/components/ElifeApp.js

@@ -6,10 +6,12 @@ import { AppBar } from '@pubsweet/ui'
 const ElifeApp = ({ children }) => (
   <div>
     <AppBar
-      brand={'eLife'}
-      user={{ username: 'Dummy User', admin: true }}
-      onLogoutClick={() => console.log('Logout clicked')}
+      brand="eLife"
       navLinkComponents={[<Link to="/">Dashboard</Link>]}
+      onLogoutClick={() => {
+        /* empty function for now */
+      }}
+      user={{ username: 'Dummy User', admin: true }}
     />
     <div>{children}</div>
   </div>