Added a method configGetOriginal which will return the original config data.

[aritomelo]

Motivation:

• DrupalDriver configGet() method which uses the Drupal "get" method to retrieve the configuration. The problem is that the latter takes override into account which means that when the Behat extension restores the config backups, it will save the override instead of the original config value.

By providing this method, when the Behat extension restores the config it will take the original data from configuration (eg.:settings.php).

[jhedstrom]

How would this be used? It's hard to tell since it only adds the method in this PR, but it isn't used...

[upchuk]

@jhedstrom This one fixes #194. And it will be used by the extension, see issue jhedstrom/drupalextension#501. A PR will follow also for that.

[aritomelo]

@jhedstrom Hi mate the second PR can be found here: jhedstrom/drupalextension#503

[jhedstrom]

Cool, that makes sense. Thanks!