0.3.0

• Made Sources a MutableSequence (#36)
• Started using consistent terminology for source numbers and added the option to insert a source with a specific number (#47)
• Added support for implicit source numbering (#48)
• Documented sources and %prep macros in README (#49)
• Implemented high-level manipulation of version and release (#54)
• Added support for %autochangelog (#56)
• Added remote property to sources and enabled addition of Sources (#59)
• Implemented mid-level manipulation of %prep section, including modification of %prep macros (#37, #52)