title: With GitHub how do I push all branches when adding an existing repo?
body: <p>I created a new GitHub repo - I want to put my existing repo there.<br>
  I followed the instructions:</p>
  
  <pre><code>cd existing_git_repo
  git remote add origin git@github.com:acme-org/myprj.git
  git push origin master
  </code></pre>
  
  <p>This only pushes the master branch to GitHub.<br>
  How do I push everything (including all branches) in my existing repo to my new GitHub repo? </p>