0.10.0

Breaking

• To initialize a project a path is required even is the project is being
  initialized from scratch.
• To open an existing project Xcodeproj::Project.open should be used in place
  of Xcodeproj::Project.new, which now is deprecated for that purpose.
• Project#save_as has been renamed to Project#save which uses the path
  provided during initialization by default.
• The parameter to specify a subgroup of the helper methods to create file
  references and new groups (e.g. #new_file, #group) has been deprecated.
• Removed PBXGroup#new_xcdatamodel_group.
• [PBXFileReference] #update_last_known_file_type has been renamed to
  #set_last_known_file_type. Added #set_explicit_file_type.
• [PBXGroup] Renamed #sort_by_type! to #sort_by_type.
• [Project] #add_system_framework now adds the reference to the frameworks
  build phase of the target as well.

Enhancements

• CoreData versioned models are now properly handled respecting the contents of
  the .xccurrentversion file.
  CocoaPods/CocoaPods#1288,
  #83
  Ashton-W
• [PBXGroup, PBXFileReference] Improved source tree handling in creation
  helpers. Now it is possible to specify the source tree which will be used to
  adjust the provided path as needed.
• Added PBXGroup#parent, PBXGroup#real_path, PBXFileReference#parent
  (replaces #group), and PBXFileReference#real_path.
• Xcodeproj will automatically utilize the
  xcproj command line tool if available in
  the path of the user to touch saved projects. This will result in projects
  serialized in the exact format used by Xcode.
• [PBXGroup] Improved deletion.
• [PBXGroup] Added #recursively_sort_by_type.
• [PBXGroup, PBXFileReference] Added #move.
• [AbstractTarget] Added #add_build_configuration.