mruby/mruby — pull request #517 by skandhas (2012-10-30 06:08:11+00:00)
Title: fix cannot get/set const variable form singleton class

Example:
```ruby
class T
class << self
VERSION = "1.0.0"
end
end

p T.singleton_class::VERSION
```
Ruby 1.9.2 ouput:
```ruby
"1.0.0"
```

MRuby ouput:
```ruby
TypeError: constant look-up for non class/module
```