updated doc to work with JDBS tooling

in the "iOS Build" section I believe we should update the relevant MacOSX /iOS versions stated cause I think they are old. If the tools do not support them, feel free to ignore this comment

s/ Mac OS X Lion (10.7) (or later)/ Mac OS X Mountain Lion (10.8.x) or Mac OS X Mavericks (10.9.x)
and:
s/Xcode 4.3 or later/ Xcode version 5.0 and later

I believe all major players should offer support for Xcode 5 by now, the current stable series (also the first release offering iOS 7 support)