title: Cannot push to GitHub - keeps saying need merge
body: <p>I'm new to <a href="http://en.wikipedia.org/wiki/GitHub">GitHub</a>. Today I met some issue when I was trying to push my code to GitHub.</p>
  
  <pre><code>Pushing to git@github.com:519ebayproject/519ebayproject.git
  To git@github.com:519ebayproject/519ebayproject.git
   ! [rejected]        master -&gt; master (non-fast-forward)
  error: failed to push some refs to 'git@github.com:519ebayproject/519ebayproject.git'
  hint: Updates were rejected because the tip of your current branch is behind
  hint: its remote counterpart. Merge the remote changes (e.g. 'git pull')
  hint: before pushing again.
  hint: See the 'Note about fast-forwards' in 'git push --help' for details.
  </code></pre>
  
  <p>I have not pushed anything in the repository yet, so why do I need to pull something?</p>