Refactor XCScheme API to enable multiple targets
[XCScheme] Mimic Xcode output
Merge branch 'master' of https://github.com/jasonprado/Xcodeproj into jasonprado-master

* 'master' of https://github.com/jasonprado/Xcodeproj:
  Refactor XCScheme API to enable multiple targets
[ProjectHelper] Handle the creation of product references for all the target types
[XCScheme] Add support for targets of every type
[XCScheme] Desume the container from the target of the project