title: Changing git setup to allow multiple users to push/commit files
body: <p>I've got a beaglebone that I set up a while back (when I was first learning git) with an ssh key for a specific github account. That account is our company's main account. Many people work directly on, and push to github directly from, the beaglebone. I'd like to change the settings so that whenever someone wants to commit or push to github they are queried for their username.</p>
  
  <p>My most recent commit and push looks like this... you'll see I have no option to enter a username, just the password for our company's main account.</p>
  
  <pre><code>root@beaglebone:/var/lib/cloud9/pypos# git commit -a -m "class restructured and passing the new updated test script"
  [class_restructure 1db2e33] class restructured and passing the new updated test script
   2 files changed, 14 insertions(+), 10 deletions(-)
  root@beaglebone:/var/lib/cloud9/pypos# git push origin class_restructure
  Enter passphrase for key '/home/root/.ssh/id_rsa':
  Counting objects: 7, done.
  Compressing objects: 100% (4/4), done.
  Writing objects: 100% (4/4), 531 bytes, done.
  Total 4 (delta 3), reused 0 (delta 0)
  To git@github.com:FarmDesign/pypos.git
     83831a8..1db2e33  class_restructure -&gt; class_restructure
  root@beaglebone:/var/lib/cloud9/pypos#
  </code></pre>