title: Different filename for global composer.json
body: <p>Just started working with composer and having some issues installing apps globally. I am using this on a linux machine running ElementaryOS. When I run <code>composer global require "laravel/installer"</code> it gives me an error that it cannot find <code>./composer.json</code> file in the current directory. First why would I need something that I am installing globally?</p>
  
  <p>So if I need one, could I just create in my home directory a .composer.json and when I do a global install can I just point to that file?</p>