title: Activator is not starting after exporting the eclipse plugin
body: <p>I am new to Eclipse plugin development and I have just completed development of my 1st plugin.</p>
  
  <p>It's running without any issues, when I run the project as an "Eclipse Application". So I exported the plugin and installed it to another distribution of eclipse. But now it's not working as I expected.</p>
  
  <p>Inside my <code>activator.start()</code> I added few even listeners and neither of them are getting triggered. Later I found this <code>start()</code> method is not fired after I export the product.</p>
  
  <p>To make sure, I used <code>MessageConsoleStream</code> and print something to the console.
  Again this is working in the development time, but not in the exported version.</p>
  
  <p>But the view of the plugin is displayed without any problems.</p>
  
  <p>What has gone wrong?</p>
  
  <p><em>Eclipse version : 4.4.2</em></p>