Merge pull request #631 from derrabus/2.8

Symfony 2.2
Added Symfony HTTP Foundation to vendors.
We use namespaces for new classes.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
Use Symfony's Response class.
I missed that one...
PMF_Helper_Http is now deprecated, removed already unused methods.
Copy all Symfony packages.
Use Symfony's Response class.
Removed unused methods.