Add reference to remote_code.rb in gemspec. Fixes #6

gollum-lib.gemspec

@@ -63,6 +63,7 @@ Gem::Specification.new do |s|
     lib/gollum-lib/markups.rb
     lib/gollum-lib/page.rb
     lib/gollum-lib/pagination.rb
+    lib/gollum-lib/remote_code.rb
     lib/gollum-lib/sanitization.rb
     lib/gollum-lib/web_sequence_diagram.rb
     lib/gollum-lib/wiki.rb