[Constants] Add file types for xcodeproj and xctest
[Object] Style
[AbstractObjectAttribute] Style
[AbstractObjectAttribute] Factor out name conversion
[AbstractObjectAttribute] Validate the keys of reference by keys attributes
[ObjectDictionary] Style and docs
[ObjectDictionary] Complete implementation
[Constants] Add support for mdimporter adn octest
[FileReferencesFactory] Add support for adding subprojects
[Changelog]
Merge pull request #172 from CocoaPods/fabio-add-subproject

Add support for adding subprojects