attribute.name and association.name partial paths  

This allows you to specify partial overrides based on attribute or association name for the whole system and not only on specific models.

I needed to customize an attribute's partial with a file_field input on more than one model. E.g.,

````
class Product < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

class Post < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end
````

I can now add a partial to ````app/views/upmin/partials/attributes/_image.html.haml```` to override the attribute's partial for both models in Upmin.