Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Should not make a difference most of the time, since if they're participating in the thread, they have access to the project.

Remove emphasis from system notes to avoid Markdown conflicts in names.

Also refactor NotificationService a bit

signe-in -> signed-in
go_to_gihub_for_permissions -> go_to_github_for_permissions
descendand -> descendant
behavour -> behaviour
recepient_email -> recipient_email
generate_fingerpint -> generate_fingerprint
dependes -> depends
Cant't -> Can't
wisit -> visit
notifcation -> notification
sufficent_scope -> sufficient_scope?
levet -> level

It does disable all emails expect system one or when you was @mentioned

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

and more readable.

We were still passing a 'password' argument around, but it is not used
anywhere because we send a password reset link in the welcome email
nowadays.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>