fixed a custom assert method in SummaryUpdateServiceSpec because it ignored any failure
fixed a bug that summary count of the channel which has no irclog record is still yesterday's count
replaced DateUtils' methods by corresponding GDK methods
tweaked IrclogLogAppender

- to use DateUtils.today
- renamed: createPermaId -> generatePermaId
fixed a bug that time of 'time' column was reset to 00:00:00 when paging
moved code to generate permaId into Irclog

because it's the one of important domain logic
prohabited UPDATE for Irclog

irclog can be inserted but not updated because it's a 'record'