Merge pull request #9 from pokap/master

EKINO_DRUSH_FROM already exists
prevent a double rendering of the output
Merge pull request #12 from lkazus/master

Prevent a double rendering of the output
Merge pull request #11 from pokap/master

Fix conflict between sessions drupal and symfony
Fix bug
Update Drupal/Drupal.php
Update Resources/config/services.xml
Update Drupal/Drupal.php
Merge pull request #14 from pokap/master

Compatibility with Drush >= 5.0
Update README.md