title: Ngrx angular 2 How should I set initial state?
body: <p>I am using angular 2 and Ngrx.</p>
  
  <p>I have main component App where I am subscribing to app title in NgOnInit function
  And I have child component Home where I am dispatching this title also in NgOnInit cause I want to change title when user visit home component.</p>
  
  <p>The problem is that my App component is parent of Home component, and it is called first, so in my subscribe I end up with undefined object which should contain title.</p>
  
  <p>What is the best solution for this?
  I can set initial title in constructor (it is called first)
  I can get title in subscribe like this: <code>(store || {}).title</code>
  Or is any way to set initial state in reducer?</p>