title: changing the default keybindings of the Ace editor
body: <p>I'm using the vim mode and would like to change the behavior of 'j' to 'gj' and 'k' to 'gk'. I tried using the following:</p>
  
  <blockquote>
    <p>editor.commands.bindKey("j", null);
    editor.commands.bindKey("j", "golinedown");</p>
  </blockquote>
  
  <p>But 'j' still has the default behavior of going to the next line in the file (rather than the next line on screen). As a workaround, I'm currently using: </p>
  
  <blockquote>
    <p>editor.commands.bindKey("cmd-j", "golinedown");</p>
  </blockquote>
  
  <p>which works since cmd-j isn't used for anything else. How can I change the default key binding for 'j','k'? </p>