Merge pull request #2 from heaven7/mailbox

Mailbox
message mailer templates added
message mailer works delayed and localized
cleaning up
message notifications are stored localized in db
preparing message-notifications for autoupdate by viewing message
message-notifications autoupdate when receiver view message
cleaning up
group notifications localized
group translation show
Merge branch 'master' of https://github.com/heaven7/iwyg
more description on group index
notifications unread fix
messages id
notification link_to fix
notification link_to fix
notification link_to fix
notification link_to fix
mailbox specs
sending and replying message specs