Updates Uploadable example for symfony 2.4

Form::bind is deprecated (and simply doesn't work any more) and getEntityManager is also deprecated (but still working).
Merge pull request #237 from Green-Cat/patch-1

Updates Uploadable example for symfony 2.4
[DoctrineExtensions] updated links.
Merge pull request #238 from aitboudad/patch-1

[DoctrineExtensions] updated links.
remove outdated warning about the missing XML mapping driver
Merge pull request #247 from xabbuh/remove-outdated-warning

remove outdated warning about the missing XML mapping driver
use psr-4 autoloader
Merge pull request #255 from jrobeson/patch-1

use psr-4 autoloader
ip-traceable listener
Push again lost commit + No injection of Request service
Doc update
Fix request hendling
Fix master request test