Pajk/apipie-rails — pull request #99 by iNecas (2013-02-18 14:05:56+00:00)
Title: Allow specify additional params outside of param group

Especially useful for hash params. For example:

```ruby
def_param_group :user do
param :user, Hash do
param :name, String
end
end

param_group :user
param :user, Hash do
param :password, String
end
```