Events for tags
Flash messages for links
Flash message display on missing pages
Visual tweaks to manager
Further comment events
Remove posts from search index when deleting

Fixes a "remove" vs "delete" bug in search and also cascades delete
operations down to comments and kudos. Comments are now ordered by
parent_id to ensure leaves are deleted first.
Log interesting events
Better formatting for invalid comment messages
Formatting of log messages going to nice to know
nicetoknow is now a global log

No longer environment specifc
Log 404 errors
Use Symfony's request object for Monolog processor

Means the correct client IP and the full URL for a request are now
available.
Merge branch 'logging'