'Scroll to End of Log' in output window
Group builds by date
Added class for #previous_builds li
Added ids to elements accessible from js
Added 'Postmark' to example notifiers list; remove duplications: in init.rb - default values, in local.rb - explanation
Use started_at for grouping builds
Merge pull request #284 from Bishop/correction

Added 'Postmark' to example notifiers list
Merge pull request #278 from Bishop/scroll

'Scroll to End of Log' in output window
Merge pull request #283 from Bishop/groups

Group builds by date