Add user delete option.

app/controllers/registrations_controller.rb

 class RegistrationsController < Devise::RegistrationsController
   before_filter :signup_enabled?
 
+  def destroy
+    if current_user.owned_projects.count > 0
+      redirect_to account_profile_path, alert: "Remove projects and groups before removing account." and return
+    end
+    current_user.destroy
+
+    respond_to do |format|
+      format.html { redirect_to new_user_session_path, notice: "Account successfully removed." }
+    end
+  end
+
   private
 
   def signup_enabled?

app/views/profiles/account.html.haml

@@ -77,4 +77,10 @@
       .input
         = f.submit 'Save username', class: "btn btn-save"
 
-
+- if Gitlab.config.gitlab.signup_enabled
+  %fieldset.update-username
+    %legend
+      Remove account
+      %small.cred.pull-right
+        Before removing the account you must remove all projects!
+    = link_to 'Delete account', user_registration_path, confirm: "REMOVE #{current_user.name}? Are you sure?", method: :delete, class: "btn btn-remove delete-key btn-small pull-right"
\ No newline at end of file