title: remote: Invalid username or password. fatal: Authentication failed
body: <p>I'm just getting started with Git/Github and I'm completely stuck. I'm using Terminal on Mac/OSX El Capitan and when it asks for password it tells me it is invalid, but I am entering the same password that I created for my GitHub account, so surely this should work? What am I doing wrong?</p>
  
  <pre><code>Last login: Sun Dec  4 10:46:35 on ttys000
  Seans-MBP:~ mrseanbaines$ git push -u origin master
  Username for 'https://github.com': mrseanbaines
  Password for 'https://mrseanbaines@github.com': 
  remote: Invalid username or password.
  fatal: Authentication failed for 'https://github.com/mrseanbaines/cartwheeling-kitten.git/'
  Seans-MBP:~ mrseanbaines$
  </code></pre>