add option for never deleting records from db

lib/acts_as_paranoid/core.rb

@@ -111,7 +111,7 @@ def destroy
             self
           end
         end
-      else
+      elsif !paranoid_configuration[:never_delete]
         destroy!
       end
     end

test/test_core.rb

@@ -352,4 +352,10 @@ def test_string_type_with_no_nil_value_after_destroyed_twice
     2.times { ps.destroy }
     assert_equal 0, ParanoidString.with_deleted.where(:id => ps).count
   end
+
+  def test_string_type_destroyed_twice_but_never_deleted
+    ps = ParanoidStringNeverDeleted.create!(:deleted => 'not dead')
+    2.times { ps.destroy }
+    assert_equal 1, ParanoidStringNeverDeleted.with_deleted.where(:id => ps).count
+  end
 end

test/test_helper.rb

@@ -36,6 +36,11 @@ def setup_db
       t.string    :deleted
     end
 
+    create_table :paranoid_string_never_deleteds do |t|
+      t.string    :name
+      t.string    :deleted
+    end
+
     create_table :not_paranoids do |t|
       t.string    :name
       t.integer   :paranoid_time_id
@@ -202,6 +207,10 @@ class ParanoidString < ActiveRecord::Base
   acts_as_paranoid :column_type => "string", :column => "deleted", :deleted_value => "dead"
 end
 
+class ParanoidStringNeverDeleted < ActiveRecord::Base
+  acts_as_paranoid :column_type => "string", :column => "deleted", :deleted_value => "dead", :never_delete => true
+end
+
 class NotParanoid < ActiveRecord::Base
 end