fixes #2480: Report for contributors

app/logical/reports/contributors.rb

@@ -0,0 +1,9 @@
+require 'statistics2'
+
+module Reports
+  class Contributors < User
+    def users
+      ::User.where("users.level >= ? and users.post_upload_count >= 250", ::User::Levels::CONTRIBUTOR).order("created_at desc").limit(50).map {|x| Reports::UserPromotions::User.new(x)}
+    end
+  end
+end