Fullscreen support

Added fullscreen support for iOS >= 7.1.x and changed webpage title to
Siri API
Commented and moved to viewport

Comment fullscreen line
Added fullscreen support for iOS <= 6

Added scroll javascript workaround to show a fullscreen on iOS <= 6.
Workaround only runs if iOS 7 is not detected.

Now only iOS versions between 7.0.x and 7.1.x are unable to show the
fullscreen caused by a bug in safari in these iOS versions