+ Page#all_subpages now partitioned by #dated_path?
+ Extended Page#dated_path? to include yearly/monthly index pages.
+ Added Page#tag_list.
+ Added GeneratedIndex subclass of FakePage.
+ Added TagIndex, TagDetail, MonthlyPage, YearlyPage, SeriesPage
- Site#fix_subpages no longer reverse sorts... that's someone else's job.
+ Added Enumerable#multi_group_by

[git-p4: depot-paths = "//src/ZenWeb/dev/": change = 9851]