fixed location

Fixed issue when no headers were displayed if it was redirection. Because of symfony browser-kit internally holds this situation: 
https://github.com/symfony/BrowserKit/blob/master/Client.php#L326
https://github.com/symfony/BrowserKit/blob/master/Client.php#L332

Now user will be able to see all headers before he will be redirected.

Example:
```yaml
Trying to ensure that login works (LoginCept.php)       
Scenario:
* I am on page "/basic/web/index-test.php?r=site/login"
  [Response] 200
  [Page] http://localhost/basic/web/index-test.php?r=site/login
  [Cookies] []
  [Headers] {"content-type":["text\/html; charset=UTF-8"]}
* I see "Login","h1"
* I am going to try to login with correct credentials
* I submit form "#login-form",{"LoginForm[username]":"admin","LoginForm[password]":"admin"}
  [Uri] /basic/web/index-test.php?r=site/login
  [Method] post
  [Parameters] {"_csrf":"aVBnTzd5a0U4HzYlUCwRfBEWUzh6NwEnGQUGJ0IoOhoLNwAeWiwocQ==","LoginForm":{"username":"admin","password":"admin","rememberMe":"0"}}
  [Headers] {"location":["http:\/\/localhost\/basic\/web\/index-test.php"]}
  [Response] 200
  [Page] http://localhost/basic/web/index-test.php
  [Cookies] {"_csrf":"fe2ccfc38a2c95ff099379b79decd03addd67702bbc004df46131eae7fe3df66s:32:\"QOQjgUz9xF4wMNjbpUahuQQ_bggQmUC4\";"}
  [Headers] {"content-type":["text\/html; charset=UTF-8"]}
* I expect to see user info
* I see "Logout (admin)"
 PASSED 
```