title: How do you create a meteorJS package with build options for the user?
body: <p>I'm creating a meteor package for a JS library that contains a number of optional plugins in the main repository.  I would like to provide the option for the user to select which library extensions to use, without always including them unnecessarily.</p>
  
  <p>Is this possible with the current build system?  If so, where do I begin?</p>