Carousel doesn't stop if calling cycle several times before calling pause

Describe the bug
If you have a carousel and call several times the cycle method, then calling the pause method does not work

Expected behavior
it doesn't matter how many time you call cycle. If after a few calls to cycle you call pause, the carousel should pause

Additional context
The cycle method is:

/**
 * Set an interval to cycle through the carousel items
 */
Carousel.prototype.cycle = function () {
    var _this = this;
    if (typeof window !== 'undefined') {
        this._intervalInstance = window.setInterval(function () {
            _this.next();
        }, this._intervalDuration);
    }
};

As you can see, it doesn't check if it already had a called setInterval before, so calling it several times will make impossible to stop the timer. The proper fix can be something like this:

/**
 * Set an interval to cycle through the carousel items
 */
Carousel.prototype.cycle = function () {
    var _this = this;

    if (this._intervalInstance) {
        clearInterval(this._intervalInstance);
        this._intervalInstance = null;
    }

    if (typeof window !== 'undefined') {
        this._intervalInstance = window.setInterval(function () {
            _this.next();
        }, this._intervalDuration);
    }
};

Please fix it

/**
 * Clears the cycling interval
 */
Carousel.prototype.pause = function () {
    if (this._intervalInstance) {
        clearInterval(this._intervalInstance);
        this._intervalInstance = null;
    }
};

Start by locating Carousel.prototype.cycle and Carousel.prototype.pause, then reproduce the issue by calling cycle several times before pause. Done means repeated cycle calls leave only one active interval and a subsequent pause stops carousel advancement.