Add few things under the .gitignore
Fix the namespaced models for masquearades:

  - Now it's possible to use the models like this example ```Admin::User```:
  ```
  devise_for :admin_user, :class_name => "Admin::User"
  ```
  - Added spec to cover this things
Merge pull request #11 from oivoodoo/issue/on-namespaced-models

Fixing the issue on namespaced models.