title: Differences between this.props.navigation.dispatch vs this.props.navigation.navigate?
body: <p>I see a lot of folks in the react-navigation issues section using <code>this.props.navigation.dispatch</code> to programmatically navigate. Is there any specific reason or use case to use that over <code>this.props.navigation.navigate</code>?</p>
  
  <p>It seems like you can pass more options to the dispatch function? Is there anything else? Can you use dispatch without explicitly tying react-navigation into your apps redux store? Right now I have an app that has redux, but I dont explicitly configure my redux setup to know about react-navigation (and would prefer to keep it that way if I can).</p>