Add detailed info to the error message

Ready to review.
Now the input should be something like:

  Scenario: Selenium driver works
    Given I go to "/"
    │
    │  -------------------------------------------------------------
    │  /var/www/html/tests/behat/features/behat.feature:13
    │  Found 1 javascript errors
    │  -------------------------------------------------------------
    │     #0: Filename: https://static.addtoany.com/menu/modules/core.26680508.js || Error: Uncaught SyntaxError: Unexpected token . || Lineno: 1 || Colno: 48155
    │  
    │
    ╳  Found 1 javascript errors (Exception)
    │
    └─ @AfterStep 

However, I agree that a detailed report helps to detect precisely where the error is. So I'll merge it.

In any case, to detect where the error comes from it is just needed to replicate the exact steps that the test did and open Javascript console, so by reporting an error was enough.

Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.