Update Dia
Change hash attribute to digest
Merge branch 'master' into notifications

Conflicts:
	doc/db/schema.dia
	doc/db/schema.png
Fix button title in Devise edit registrations view
Refactor Probe index import/update/delete
Add Subscriptions
Add Subscriptions controller and other resoucres to manage subscriptions
Update configuration files

Signed-off-by: Samuel Molnar <molnar.samuel@gmail.com>
Add default host parameter for mails
Add subscription rake task
Refactor tests and add tests for Subscription
Merge branch 'notifications'

Conflicts:
	app/views/devise/registrations/edit.html.erb