Add width property

Possibility to set a width to the window.

Usage example:

var options = {
    animation: 300,
    width: 400,
    buttons: { 
        sim: { 
            text: 'Sim', 
            className: 'red', 
            action: function(e) { 
                //do somethig
                Apprise('close'); 
            } 
        },
        nao: { 
            text: 'Não', 
            className: 'blue', 
            action: function(e) { 
                Apprise('close'); 
            } 
        },
    },
};