new parameter for drush from Vendor directory

[outermedia-sol]

Added new Parameter -v to indicate to use Vendor parameter If -v is added as parameter /../vendor/drush/drush/drush is added to the path default for DRUSH is then /../vendor/drush/drush/drush

Only problem: could not get it to run with --config param. There was an error while checking is_drupal_root_dir. Therefore I just moved that setting to after this check.

`[preflight] Unable to parse at line 1 (near "<?php").``

[daylicron]

@outermedia-sol Thank you very much for this. It is exactly what I was looking for, to fix our current problem! :)