Removed "iPhone" and "iPad" groups.

Those groups came from a time when creating iPad specific classes was a
thing. Nowadays 99% of classes are created to be device agnostic.
Especially with size classes in iOS 8 there is no reason to segregate
iPhone and iPad classes.
Removed linking frameworks in the target's build phases.

With the addition there is no need to explicitly link against a
framework in the target’s build phases.