title: Bookreader: installing books using separate applications
body: <p>I'm developing bookreader, which has it's own book format. I want to have separate application for reader itself and books. So user firstly installs bookreader via Google Play, then installs books, that lives in Google Play as separate applications.</p>
  
  <p>So, my question is:
  1. How can I make application without launch icon (book)? Maybe using intent filters?
  2. How can I distribute books inside application and then open them using main (reader) application?</p>