title: Where should Constant variables live in Symfony2 bundle
body: <p>Maybe some will see that the question silly, however it is not.</p>
  <p>I am asking where should Constant should live in Symfony2 Bundle,
  I used in other frameworks to create my constants variable in Models, however since in Symfony2 I am using Entity, I am a bit confused.</p>
  <p>Should it live inside =&gt; Entity, Controller, Service or even config file.</p>