title: Command to move line up or down in Atom Editor
body: <p>I have used Sublime for years and am trying out Atom for the first time.</p>
  
  <p>How can I move a single line or selected block up or down by one line? In sublime I could do this with <kbd>ctrl</kbd>+<kbd>shift</kbd>+<kbd>Up</kbd>, but that doesn't seem to work in Atom. Any ideas?</p>