title: Copy git submodules from one repo to another
body: <p>I'm developing a set of libraries that depend on a common set of other libraries.</p>
  <p>I'd like to copy the .gitsubmodules file from one repo that has all of the necessary submodules into all of the other repos.</p>
  <p>However I can't seem to get git to recognize the submodules file, or otherwise do anything to pull the submodules into the new repository.</p>