title: Typesafe config: Cannot include multiple files
body: <p>I am trying to include multiple .config files:
  include "../foo1"
  include "../foo2"
  include "../foo3"
  include "../foo4"</p>
  
  <p>Only the last one seems to be effectively included (I have tried different order and always see the result of only the last file being included). 
  Any idea what could be wrong?</p>