Add evolutions file

```
$ vim conf/evolutions/default/13.sql
$ vim conf/evolutions/default/14.sql
$ vim conf/evolutions/default/15.sql
```
Fix add column error

```
$ vim app/controllers/Application.scala
$ vim app/models/Begin.scala
```
Show index_view

```
$ vim app/controllers/Users.scala
$ vim app/views/users/index.scala.html
```
Fix models

```
$ vim app/models/Begin.scala
$ vim app/models/Tweet.scala
```
Done countHash method

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

```
$ vim app/controllers/Users.scala
```
Change models

```
$ vim app/models/Tweet.scala
$ vim app/models/User.scala
```
Add chat link

```
$ vim app/views/users/index.scala.html
```
Add chat view

```
$ vim app/views/users/chat.scala.html
```
Add chat route

```
$ vim conf/routes
```
Add redirect

```
$ vim app/controllers/Users.scala
```