3.0.0

Guide to upgrading from Sprockets 2.x to 3.x

• New processor API. Tilt interface is deprecated.
• Improved file store caching backend.
• MIME Types now accept charset custom charset detecters. Improves support for UTF-16/32 files.
• Environment#version no longer affects asset digests. Only used for busting the asset cache.
• Removed builtin support for LESS.
• Removed //= include directive support.
• Deprecated BundledAsset#to_a. Use BundledAsset#included to access debugging subcomponents.
• Support circular dependencies. For parity with ES6 modules.
• Manifest compilation will no longer generate .gz files by default. Mixing
  Content-Encoding and ETags is just a bad
  idea
• Added linked or referenced assets. When an asset is compiled, any of its links will be compiled as well.
• Introduce some limitations around enumerating all logical paths. 4.x will deprecate it and favor linked manifests for compliation.
• Add Asset integrity attribute for Subresource Integrity
• Default digest changed to SHA256. Configuring digest_class is deprecated.
• Rename Asset#digest to Asset#hexdigest. Asset#digest is deprecated and will
  return a raw byte String in 4.x.
• Added transitional compatibility flag to Environment#resolve(path, compat: true). 2.x mode operates with compat: true and 4.x with compat: false
• manifest-abc123.json renamed to .sprockets-abc123.json