* Helpers

* Get Node * @param {String|Element} el * @param {Boolean} noCache * @return {Element}

* Find element * @example * find('nav') => document.querySelector('nav') * find(nav, 'a') => nav.querySelector('a')

* Toggle class * * @example * toggleClass(el, 'active') => el.classList.toggle('active') * toggleClass(el, 'add', 'active') => el.classList.add('a

* Compile sub sidebar

* Create a cached version of a pure function.

* Compile cover page

* Find all elements * @example * findAll('a') => [].slice.call(document.querySelectorAll('a')) * findAll(nav, 'a') => [].slice.call(nav.querySelect

* Simple ajax get * @param {string} url * @param {boolean} [hasBar=false] has progress bar * @return { then(resolve, reject), abort }

* Get and active link * @param {object} router * @param {string|element} el * @param {Boolean} isParent acitve parent * @param {Boolean} au

* Check if value is function

* Check if value is primitive

* Render progress bar

* Compile sidebar