Remove README.rdoc
Rename accessible_attributes to authorizer
Add debugger gem
Rename Rails 3.2 test files to test-rails-3.2
Add support for Rails 4
Create test Rails 4 app
Create models and tests for Rails 4 and add protected_attributes gem
Use strict mass assignment sanitizer in Rails 4 app and issue warning if this sanitizer is not specified
Updates to README.md describing Rails 4 support