Fixed Opml::VERSION

```ruby
1.9.3p385 :001 > require 'opml/version'
 => false 
1.9.3p385 :002 > require 'opml'
TypeError: Opml is not a class
        from /Users/ykzts/work/fastladder/vendor/bundle/ruby/1.9.1/bundler/gems/opml-3659bded5faf/lib/opml.rb:6:in `<top (required)>'
        from (irb):2:in `require'
        from (irb):2
        from /Users/ykzts/.rvm/rubies/ruby-1.9.3-p385/bin/irb:16:in `<main>'
```

...and version is 1.0.0? or 0.0.1?