17.0.0

• Added expect.extend.
• Properly resolve modules with platform extensions on react-native.
• Added support for custom snapshots serializers.
• Updated to Jasmine 2.5.2.
• Big diffs are now collapsed by default in snapshots and assertions. Added --expand (or -e) to show the full diff.
• Replaced scriptPreprocessor with the new transform option.
• Added jest.resetAllMocks which replaces jest.clearAllMocks.
• Fixes for react-native preset.
• Fixes for global built in objects in jest-environment-node.
• Create mock objects in the vm context instead of the parent context.
• .babelrc is now part of the transform cache key in babel-jest.
• Fixes for docblock parsing with haste modules.
• Exit with the proper code when the coverage threshold is not reached.
• Implemented file watching in jest-haste-map.
• --json now includes information about individual tests inside a file.