One more suggestion for implementation:
I am not sure whether you should be u...

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One more suggestion for implementation:
I am not sure whether you should be using version specific drush commands.
You have dependency on drush 6.x, but now for majority of users might have updated their drush versions to 7.x or 8.x
Because only Drush 8 allows to work with Drupal 8 related sites.

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