Merge branch 'xcproject-based-pods' of github.com:pereckerdal/CocoaPods into fabio-pods-from-projects

* 'xcproject-based-pods' of github.com:pereckerdal/CocoaPods:
  Test that linked deps get compiled and linked properly
  Test that we do not add linked projects twice
  Add support for multiple Xcode subprojects per spec
  Add support for Xcode subprojects to podspecs
  Fix documentation typo
  Fix unit test

Conflicts:
	lib/cocoapods/installer.rb
	spec/unit/installer_spec.rb
	spec/unit/sources_manager_spec.rb