v2.0.0.pre.beta

Major Enhancements

• Migrate to sassc gem (#75)
• Drop support for Ruby 2.3 (#90)

Minor Enhancements

• Generate Sass Sourcemaps (#79)
• Configure Sass to load from theme-gem if possible (#80)
• SyntaxError line and filename are set by SassC (#85)
• Memoize #jekyll_sass_configuration (#82)

Development Fixes

• Target Ruby 2.3 (#70)
• Lint with rubocop-jekyll (#73)
• Clear out RuboCop TODO (#87)
• Cache stateless regexes in class constants (#83)
• Add appveyor.yml (#76)