mruby/mruby — pull request #546 by skandhas (2012-11-12 12:53:42+00:00)
Title: add Module#class_variables

add Module#class_variables

```ruby
class One
@@var1 = 1
end

class Two < One
@@var2 = 2
end

One.class_variables #=> [:@@var1]
Two.class_variables #=> [:@@var2]
```