[RFR] Add menuView

![image](https://cloud.githubusercontent.com/assets/99944/5332763/41b4eec2-7e62-11e4-90d9-917c2ac2bfd6.png)

Closes #113
It doesn't make sense at config time (it's the default value), and we never watch the view in controllers, so changes in config at runtime are not supported anywhere...



> Le 8 déc. 2014 à 07:02, Emmanuel Quentin <notifications@github.com> a écrit :
> 
> In src/javascripts/ng-admin/Main/component/service/config/view/MenuView.js:
> 
> > +    };
> > +
> > +    /**
> > +     * @constructor
> > +     */
> > +    function MenuView() {
> > +        this.enabled = true;
> > +        this.config = angular.copy(config);
> > +        this.type = 'MenuView';
> > +    }
> > +
> > +    MenuView.prototype.isEnabled = function() {
> > +        return this.enabled;
> > +    }
> > +
> > +    MenuView.prototype.disable = function() {
> How can we re-enable the view ?
> 
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