Provide a destroy method

[hackuun]

I have a SPA and I don't want Menuspy on other pages beside where I exactly put it.
Right now, even if I navigate from the page where I required menuspy, it still exist.
Please provide a method to destroy menuspy.

[lcdsantos]

Added in v.1.2.0.

Usage:

var elm = document.querySelector('#main-header');
var ms = new MenuSpy(elm);

ms.destroy();

[ogous]

@lcdsantos what about a refresh, update method?