Clean up the error pages.

lib/components/ErrorPage.js

@@ -1,5 +1,7 @@
+import Centered from './Centered'
 import ErrorStore from '../stores/ErrorStore'
 import React from 'react'
+import Spinner from './Spinner'
 
 export default class ErrorPage extends React.Component {
 
@@ -20,15 +22,18 @@ export default class ErrorPage extends React.Component {
   }
 
   render() {
-    return <div>
-      <h1>{this.state.status}</h1>
-      <p>{this.state.message}</p>
+    return <Centered ver>
+
+      <Spinner dir="up" />
+
+      <h1 className="with-subtitle">FilePizza - {this.state.status}</h1>
+      <p className="subtitle">{this.state.message}</p>
 
       {this.state.stack
         ? <pre>{this.state.stack}</pre>
         : null}
 
-    </div>
+    </Centered>
   }
 
 }