web: Re-enable admin, for now.
core: Site title is now required.
web: Update jquery.timeago to 1.3.0
core: Add model manager for SystemEvent.
web: Move gallery setup to common js.
web: Add shout include fragment.
web: Permit other object types in drinker_name template tag.
web: Initial "timeline" view; rework session detail page.
web: Show current/last session on main page.

Less cluttered than showing all sessions.
backend: Rebuild session on drink delete.
docs: Update changelog.