Support for key command Ctrl+A+D

[aadamcik]

I miss support for Ctrl+A+D, e.g. in screen.

[jardak]

Shortcut Ctrl+A+D works fine for me if screenKeys option is disabled:

    var term = new Terminal({
      cols: 80,
      rows: 24
      // screenKeys: false - it's false by default, so simply removing this key might help
    });