getUrl = function getUrl() {
    return this.unify(this.url(), {
        extractValue: true
    });
}
Get the url of current opened website.

<example>
    :getUrl.js
    it('should get the url of the current page', function () {
        browser.url('http://webdriver.io');

        var url = browser.getUrl();
        console.log(url);
        // outputs the following:
        // "http://webdriver.io"
    });
</example>

@alias browser.getUrl
@return {String} current page url
@uses protocol/url
@type property