0.3.0

Fixed

This is a feature release - bugs were only introduced, not fixed :)

Added

• Celebration#title is now being generated for all Sundays and
  ferials (was empty)
• ferials of the Holy Week and of the last week of Advent
  have proper ranks
• new rank Ranks::COMMEMORATION introduced;
  during privileged seasons, suppressed memorials, which
  can be commemorated in the Divine Office (see GILH 239),
  appear in Day#celebrations with this rank
• memorial of the Immaculate Heart of Mary
  (although it really belongs to the sanctorale, as a movable feast
  it is implemented in Temporale)
• support for extending Temporale with additional feasts
  (Temporale.with_extensions, Temporale.add_celebration,
  additional optional argument accepted by Calendar.new and
  Calendar.for_date)
• Temporale::Extensions::ChristEternalPriest - Temporale extension
  implementing the feast of Christ the Eternal Priest,
  celebrated in some dioceses and religious institutes
  on Thursday after Pentecost
• Temporale::Dates - module containing all the
  temporale-solemnity-date-computing algorithms used in Temporale
• Temporale#year
• sanctorale data files may have YAML front matter
  (a YAML document with metadata placed before the main content)

Changed

• seasons and colours are represented by Season and Colour
  instances, not by Symbols
• Temporale#advent_sunday and most #*_advent_sunday
  removed, only Temporale#first_advent_sunday remains
• Temporale#weekday_before, #weekday_after, #octave_of,
  #monday_before etc., #monday_after etc. removed
  (all these general date helpers now reside in Temporale::Dates)
• unused attribute Day#vespers removed
• Temporale#concretize_abstract_date removed