Quiet composer install

.travis.yml

@@ -6,7 +6,7 @@ php:
   - 5.4
 
 before_script:
-  - curl -s http://getcomposer.org/installer | php
+  - curl -s http://getcomposer.org/installer | php -- --quiet
   - php composer.phar install
 
 script: phpunit -c tests/complete.phpunit.xml