activate() {
        this._super(...arguments);
        this.registerShortcuts();
    }
Only routes can implement shortcuts.
If you need to trigger actions on the controller,
simply call them with `this.get('controller').send('action')`.

To implement shortcuts, add this mixin to your `extend()`,
and implement a `shortcuts` hash.
In this hash, keys are shortcut combinations and values are route action names.
 (see [keymaster docs](https://github.com/madrobby/keymaster/blob/master/README.markdown)),

```javascript
shortcuts: {
    'ctrl+s, command+s': 'save'
}
```
For more complex actions, shortcuts can instead have their value
be an object like {action, options}
```javascript
shortcuts: {
     'ctrl+k': {action: 'markdownShortcut', options: 'createLink'}
}
```
You can set the scope of your shortcut by passing a scope property.
```javascript
shortcuts : {
  'enter': {action : 'confirmModal', scope: 'modal'}
}
```
If you don't specify a scope, we use a default scope called "default".
To have all your shortcut work in all scopes, give it the scope "all".
Find out more at the keymaster docs