Add evolutions file

```
$ vim conf/evolutions/default/7.sql
$ vim conf/evolutions/default/8.sql
```
Change Mention Model

```
$ vim app/models/Mention.scala
```
Change Controllers

```
$ vim app/controllers/Application.scala
$ vim app/controllers/Users.scala
```
Change view

```
$ vim app/views/idList.scala.html
```