У вашего броузера проблема в совместимости с HTML5
Installing and configuring Symfony 2
the php storm download link
http://goo.gl/3xQdw9
the symfony framework download link
http://goo.gl/yw6gl6
the post in my blog
http://goo.gl/MRRS0M
configuring parameters.yml so it can connect with our database.
creating a bundle
creating an entity