allow to set cookies for capturing

[masi]

The WD protocol allows cookie manipulation: https://www.w3.org/TR/webdriver1/#cookies

Make it possible to mainpulate cookies when calling capture().

Either as third parameter to the capture callback as (actions, elements, cookies):

• cookies.add(name)
• cookies.get(name)
• cookies.getAll()
• cookies.delete(name)

Or patching the functions into the actions:

• actions.addCookie(name)
• actions.getCcookie(name)
• actions.getAllCookies()
• actions.deleteCookie(name)