Update Session namespace for Symfony 2.3
Update forward method class for Symfony 2.3
Deprecated getEntityManagerForClass for Symfony2.3
Fixed require package versions.
Fixed AuthListener Test case
Fixed syntax. for php 5.3 compatibility.
Use type hinting with SessionInterface instead of Session
Remove 5.3 support
Merge pull request #6 from crocos/feature/upgrade-symfony2.3

Update Symfony 2.3