Italian translation (#2654)

* Added Italian Translation of the following files:
Changes to be committed:
	new file:   app/views/user_mailer/confirmation_instructions.it.html.erb
	new file:   app/views/user_mailer/confirmation_instructions.it.text.erb
	new file:   app/views/user_mailer/password_change.it.html.erb
	new file:   app/views/user_mailer/password_change.it.text.erb
	new file:   app/views/user_mailer/reset_password_instructions.it.html.erb
	new file:   app/views/user_mailer/reset_password_instructions.it.text.erb

* Added italian translation
Changes to be committed:
new file:   config/locales/activerecord.it.yml