0.3.3

• improve, modularize and document the code (API),
• fix failure when 'add' or 'delete' didn't match,
• fix replicating blank line issue, improve whitespace handling.

0.3.2

• overall code cleanup,
• the 'add' action no longer implies calling 'update',
• a new 'delete' action,
• 'update' action now ensures package.mask file order is preserved,
• possibility of using multiple actions in a single call.

0.3.1

• general code cleanup,
• fixed encoding-related issues,
• fixed Python 3 support,
• package.unmask being a directory is now supported.

0.3

Introduces real parsing of package.*mask files and support for 'update' and 'add' actions.