[WIP] Upgrade to symfony 2.2 and Symfony 2.3

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | yes
| BC breaks?    | yes (sf 2.0 and 2.1 is not supported)
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #46, #40
| License       | MIT