Remove static library build support

Caused non-public selectors validation warnings.
Implied usage of -ObjC and -all_load in integrating apps,
which causes uselessly bloated apps.

Only needed for XCode < 6, which are easily upgradable.
Static libraries are also more complicated to use,
compared to a framework.
Remove invalid references files from project
Hide non public #defines
Remove WonderPushFramework logical folder, rename and merge WonderPush_public.h into WonderPush.h
Share WonderPush scheme
Create a fake framework instead of embedded framework + multi arch build

This probably requires XCode 6 to build.

The problem with embedded frameworks is that they are embedded as is
within the application, so multi archs only wastes space. Moreover,
archs for the simulator makes the app no longer validate in iTunes.
Additionally embedded frameworks implies iOS 8 minimum for the apps.

We basically have to create a framework (for simplicity of use), that
acts like a shared library (for lighter weight in the app).
The modifications are based on:
  https://github.com/kstenerud/iOS-Universal-Framework

The aggregate target builds the framework for both iphoneos and
iphonesimulator, which normally implies: armv7 armv7s arm64 i386,
and x86_64.
Once linked in the application, the added weight is only (roughly)
one fourth (somehow armv7s is not explicitly present) of the whole
framework.
iOS8-specific notifiations setup

Somehow necessary for apps targeting iOS 8 (not supporting iOS 7).