based mostly on @shazron's patch from phonegap/phonegap-plugins@d4ce61d
with changes to take account of the alunny/ChildBrowser changes. Also,
changed ChildBrowserViewController#supportedInterfaceOrientations to
work on iOS 5 (Shaz's change references an iOS6-only constant)

will not be compatible with earlier versions of Cordova, most likely.
Gonna version this one as 4.x

will also, likely, be followed by a flurry of bug fix commits. It did
compile though!