Generate targets with same build settings as Xcode (related to #164)

With the new version of the toolchain and Xcode, there were introduced new target types (iOS Framework) and some new build settings (i.e. if the target uses Swift.). We have to ensure that the generated targets build settings match those Xcode will create. This PR is related to #164.

Therefore I created a sample project, with a target for each type, dumped their build settings to xcconfig files, built an integration spec, and changed the constants so that the build settings will match the parsed xcconfig files.

Currently there will fail some specs, where we might need to discuss, how Xcodeproj should behave.