Send an email to the admins when a user needs approval after sign in refs #1186
Notify user when his registration to the website is approved. refs #1186
Small tests for user approved notification. refs #1186
Small corrections to approval notification tests
More tests and refactorings for admin approval email
Merge branch 'master' into branch-v2-feature-1186

Conflicts:
	spec/models/user_spec.rb
Better confirmation email subject, it's not always for confirmation

More generic title since this email is sometimes used just to inform the
user that the registration was successful.

refs #1186
Add tests and localization for AdminMailer

refs #1186
Merge pull request #47 from mconf/branch-v2-feature-1186

Notifications for user registration and approval

refs #1186