Update autocomplete design and scroll it correctly

src/autocomplete/AutocompleteProvider.js

@@ -1,4 +1,5 @@
 import Q from 'q';
+import React from 'react';
 
 export default class AutocompleteProvider {
     constructor(commandRegex?: RegExp, fuseOpts?: any) {
@@ -51,4 +52,12 @@ export default class AutocompleteProvider {
     getName(): string {
         return 'Default Provider';
     }
+
+    renderCompletions(completions: [React.Component]): ?React.Component {
+        return (
+            <div>
+                {completions}
+            </div>
+        );
+    }
 }