title: How do I use a subscription in flow-router?
body: <pre><code>// server/publications.js
  Meteor.publish('crewMessages', function(crewId) { 
    return CrewMessages.find({crewId: crewId}, {sort: {submitted: -1}, limit: 100});
  });
  
  // lib/router.js
  FlowRouter.route('/crew/:crewSlug', {
      subscriptions: function(params) {
          console.log("Subscribed to this crew's chat messages:", params.crewSlug);
          this.register('crewMessages', Meteor.subscribe('crewMessages', params.crewSlug));
      },
      action: function(params) {
        FlowLayout.render("layout", { content: 'crew' });
      }
  });
  </code></pre>
  
  <p>And inside my <code>crew.html</code> template:</p>
  
  <pre><code>&lt;div class="container"&gt;
    {{&gt; crewChat}}
  &lt;/div&gt;
  </code></pre>
  
  <p>And my <code>crewChat.html/js</code>:</p>
  
  <pre><code>Template.crewChat.helpers({
    messages: function() {
      return CrewMessages.find({}, {sort: {submitted: -1}}); 
    }
  });
  
  &lt;div class="ui feed"&gt;
    {{#each messages}}
      {{&gt; crewChatMessage}}
    {{/each}}
  &lt;/div&gt;
  </code></pre>
  
  <p>In my <code>crewChat.js</code> file, how can I use the subscription I set in Flow-router?</p>