Added

• Ferrum::Page#device_pixel_ratio returns the ratio of the resolution in physical pixels to the resolution in CSS pixels for the current display device.
• Ferrum::Network#cache(disable: true | false) whether or not to use cache for every request
• Ferrum::Network::Exchange#redirect? determines if the exchange is a redirect
• Ferrum::Network::Exchange#xhr? determines if the exchange is XHR
• Ferrum::Network::Request#xhr? determines if the request is XHR
• Ferrum::Network::Response#loaded? returns true if the response is fully loaded
• Ferrum::Network::Response#redirect? returns true if the response is a redirect
• Ferrum::Node#in_viewport? checks if the element in viewport (optional argument scope as Ferrum::Node)
• Ferrum::Node#scroll_into_view - scrolls to element if needed (when it's not in the viewport)
• Ferrum::Cookies#each - is now Enumerable and supports each method