rails/activemodel-globalid — pull request #11 by chetan (2014-06-06 19:22:53+00:00)
Title: require rails/railtie first

Was getting the following error when trying to load the gem:

```
.../lib/active_model/global_identification.rb:6:in `': uninitialized constant ActiveSupport::Concern (NameError)
from .../lib/active_model/global_identification.rb:5:in `'
from .../lib/active_model/global_identification.rb:4:in `'
from .../lib/active_model/railtie.rb:3:in `require'
from .../lib/active_model/railtie.rb:3:in `'
from .../config/application.rb:4:in `require'
from .../config/application.rb:4:in `'
```