Test for Smyfony 2

It's my first Symfony 2 project, so there should be much room for performance improvements (for example create a stripped project like the one for django to remove doctrine and use raw SQL instead).

If I have enough time I will try to implement the same test for Zend2 later today as well.

EDIT - since some tests indicated that zend2 (even with class cache) is slower then symfony 2, I implemented a silex test instead. 

P.S could someone test if this works with the benchmark? I couldn't get the benchmark up and running (even though I corrected the spelling for the failing install command) the last time I tried (yesterday morning).