Reverting the collection name check on insert.

[ RUBY-492 ]

Author: durran

lib/mongo/collection.rb

@@ -369,9 +369,6 @@ def save(doc, opts={})
     #
     # @core insert insert-instance_method
     def insert(doc_or_docs, opts={})
-      if name.start_with?("system.") && name !~ /(\Asystem\.users)|(\Asystem\.indexes)/
-        raise Mongo::InvalidNSName, "cannot insert into system collections."
-      end
       doc_or_docs = [doc_or_docs] unless doc_or_docs.is_a?(Array)
       doc_or_docs.collect! { |doc| @pk_factory.create_pk(doc) }
       write_concern = get_write_concern(opts, self)

test/functional/collection_test.rb

@@ -1075,20 +1075,6 @@ def test_ensure_index_timeout
     coll.ensure_index([['a', 1]])
   end
 
-  def test_insert_raises_exception_on_system_collection
-    collection = @@db["system.foo"]
-    assert_raise Mongo::InvalidNSName do
-      collection.insert({ :a => 1 })
-    end
-  end
-
-  def test_save_raises_exception_on_system_collection
-    collection = @@db["system.foo"]
-    assert_raise Mongo::InvalidNSName do
-      collection.save({ :a => 1 })
-    end
-  end
-
   if @@version > '2.0.0'
     def test_show_disk_loc
       @@test.save({:a => 1})