Minor update to comments
[Bundler] update
[XCBuildConfiguration] Pretty print support
[PBXBuildFile] Pretty print support
Minor update to comments
[XCBuildConfiguration] Improve pretty print support
[AbstractTarget] Pretty print support
[AbstractObjectAttribute] Fix nasty bug that lead sharing the same instance as the default value of an attribute.
[Object] Fix warning printed in specs
[AbstractObject] Pretty print support
complete pretty print support