first stable version

Features:

• Support following tested node types:
  • PBXProject
  • XCConfigurationList
  • PBXNativeTarget
  • PBXTargetDependency
  • PBXContainerItemProxy
  • XCBuildConfiguration
  • PBXSourcesBuildPhase
  • PBXFrameworksBuildPhase
  • PBXResourcesBuildPhase
  • PBXBuildFile
  • PBXReferenceProxy
  • PBXFileReference
  • PBXGroup
  • PBXVariantGroup
• Improved original sort-Xcode-project-file based on which in webkit project:
  • sort PBXFileReference and PBXBuildFile sections
  • avoid creating new file if no changes made