Fix use of wrong constant
Add option to dump SQL queries in stderr
Update to symfony 2.3.9
Merge pull request #902 from romainneutron/dump-stderr

[3.8] Add option to dump SQL queries in stderr
Merge pull request #903 from romainneutron/symfony

[3.8] Update to symfony 2.3.9
Merge branch '3.8'

Conflicts:
	lib/classes/task/abstract.php