Better syntax support

Please compare the following code:

```php

$loginForm->findElement(WebDriverBy::xpath('//input[@name="email"]'))
	->sendKeys('example@domain.com');
$passWordElement = $loginForm->findElement(WebDriverBy::xpath('//input[@name="password"]'));
$passWordElement->sendKeys('password');
Assert::same('password', $passWordElement->getAttribute('value'));

```

With the following pull is syntax simplier and nicer! :-)

```php
$loginForm = $lightBox->findElement(WebDriverBy::id('frm-signInForm'));
$loginForm->findElement(WebDriverBy::xpath('//input[@name="email"]'))
	->sendKeys('example@domain.com');
Assert::same('password', $loginForm->findElement(WebDriverBy::xpath('//input[@name="password"]'))
	->sendKeys('password')
	->getAttribute('value')
);
```