Maintenance Release

• Widen version constraints on dependencies: build and sass.
• Remove use of the deprecated indented parameter when compiling with sass.

• Set max SDK version to <3.0.0

• Output style is now compressed by default for release builds.

• Fix bug where compiling Dart package imports in Windows environment would fail.

• Fix bug where .sass entrypoints were not being compiled with "indented" syntax.
• Remove all temp file creation. Files are now imported using a custom AsyncImporter.

New Feature

• Add a builder which will clean up .scss and .sass sources for --release builds.

Breaking Change

• Remove the pub transformer.

• Add option to configure output style. Supports expanded or compressed as provided by the Dart implementation of Sass. Defaults to expanded.
• Removed dev dependencies that were no longer used.