Updated dependencies to symfony 2.3
Merge pull request #9 from norzechowicz/symfony23

Updated dependencies to symfony 2.3
Fix block rendering from parent template

If block not found in current template, search the parent, before moving
to other template
Added basic tests for block rendering
Travis added, copyright fix
Fix dependency: form + twig bridge

Missing dependency is causing travis to fail
Merge pull request #10 from stanislavprokopov/master

Fix block rendering