Update SymfonyRequirements to fit Sf3 DirStruct


![ss 2014-06-18 at 03 15 41](https://cloud.githubusercontent.com/assets/2379631/3313915/b810b27c-f6ea-11e3-81fc-08c351f0a67c.png)
SymfonyRequirements modified to verify both /var/cache ( /var/cache ) directory AND /app/logs ( /app/logs ) according to the new Symfony 3 directory structure.