title: Should I commit nested git submodules?
body: <p>I have a kohana email module(<code>modules/email</code>) as a git submodule in my project and the email module has a git submodule itself(<code>vendors/swiftmailer</code>).<br>
  When I init the <code>swiftmailer</code> submodule from within the <code>modules/email</code> submodule it shows the the modules/email is modified.<br>
  I don't want to commit it because I didn't change it plus I committed it before and it broke my git index(which I spent too much time fixing).<br>
  <strong>What should I do? Add it to .gitignore or is there something better?</strong><br>
  I have little experience with git submodules. So thanks for any advice.</p>