fix typo: 'avaialble' -> 'available'

Merge branch 'separate_user_and_issue_observer_from_mail_observer' of https://github.com/robbkidd/gitlabhq into robbkidd-separate_user_and_issue_observer_from_mail_observer

load assets group to allow lazy compilation in production

Downgrade Raphael.js

Get rid of deprecated link_to_function

:issue snuck back in during rebasing.

Must have snuck in during one of the multiple rebases while observers were
being refactored.

It helps to actually deliver messages.