Chores and added feature to customize logout related
- Chore: Only use resource_params for create and update action (issue 73)
- Chore: Localization for style helpers (issue 74)
- Chore: Refactor class mapper to allow descendents (issue 75)
- Chore: Remove is_origin metadata (issue 76)
- Support: Manual tested under Rails 4.2 (issue 77)
- Feature: Ability to customize logout_path, logout_method, email_method (issue 78)