3gs support

[coryalder]

Having issues with this on a 3gs.
[UIScreen screens] count] is always 1.

It seems like in your documentation this should work on a 3gs... any ideas?

[mtedesco]

Confirm - this doesn't work on a 3gs, but it works great from an iPad. Would love to know how to get this to work on the 3gs as well.

Fantastic project - thank you for posting this. We hope to use this in an assistive technology application.

[robterrell]

In my testing on a 3GS, the external screen support does not exist. Since the older hack has also been removed, I don't know of a way to get it working again. There might be another newer private class we could use for 3GS support.