Fix test failure with minitest 5.3.0.
Remove old, unused gems that were used for guard in Gemfile.
Fix adapters -> profiles deprecation warning with simplecov.
Only run simplecov when the COVERAGE env var is set.
Tighly version pin style & complexity gem libraries.
Remove tailor gem from project.
Refactor Rakefile.
Align hash elements in Thor DSL methods.
Favor Hash#key? over Hash#has_key?.
Use hash rocket syntax in production code.
Eliminat unused assignments & fixed resulting logic.
Remove space between not operator and code (style).
Remove trailing commas in hashes (style).
Exclude MetadataChopper's use of eval from style checking.
Remove explicit {} surrounds for hashes as last method parameter.
Favor %w style word arrays where possible (style).
Remove unused variable assignment in rescues (style).
Be more explicit when not handling exceptions in test code (style).
Remove trailing comma in hashes in test code (style).
Remove extra blank lines (style).