title: Netty 4.0 - instanciate DefaultChannelGroup
body: <p>I am currently migrating my project from Netty 3.x to 4.0.4 Final and i have a little question about ChannelGroups.</p>
  
  <p>DefaultChannelGroup needs now an EventExecutor in the constructor.
  Unfortunately i didn´t really understand the thread model of Netty 4.0 yet.</p>
  
  <p>How can i instanciate an EventExecutor for my ChannelGroups?
  I just want the write operations beeing executed in several threads.</p>
  
  <pre><code>ChannelGroup newChannelGroup = 
  new DefaultChannelGroup(name, new DefaultEventExecutorGroup(1).next());
  </code></pre>
  
  <p>Is this the right way?</p>