Add destroy rake task

Adds several rake tasks to delete users, topics, pm's and site stats so
that you can have a fresh site but maintain site settings and category
structure.

lib/tasks/destroy.rake

@@ -0,0 +1,39 @@
+## These tasks are destructive and are for clearing out all the
+#   content and users from your site, but keeping your site settings,
+#   theme, and category structrue.
+desc "Remove all topics in a category"
+task "destroy:topics", [:category] => :environment do |t, args|
+  category = args[:category]
+  puts "Going to delete all topics in the #{category} category"
+  puts log = DestroyTask.destroy_topics(category)
+end
+
+desc "Remove all topics in all categories"
+task "destroy:topics_all_categories" => :environment do
+  puts "Going to delete all topics in all categories..."
+  puts log = DestroyTask.destroy_topics_all_categories
+end
+
+desc "Remove all private messages"
+task "destroy:private_messages" => :environment do
+  puts "Going to delete all private messages..."
+  puts log = DestroyTask.destroy_private_messages
+end
+
+desc "Destroy all groups"
+task "destroy:groups" => :environment do
+  puts "Going to delete all non-default groups..."
+  puts log = DestroyTask.destroy_groups
+end
+
+desc "Destroy all non-admin users"
+task "destroy:users" => :environment do
+  puts "Going to delete all non-admin users..."
+  puts log = DestroyTask.destroy_users
+end
+
+desc "Destory site stats"
+task "destroy:stats" => :environment do
+  puts "Going to delete all site stats..."
+  DestroyTask.destroy_stats
+end