test fixes.
including association and bumping the version to 0.0.2.
Update plain_old_model.gemspec
Update lib/plain_old_model/version.rb
minor bug fix.
Adding capability to update read only attribute & Removing attributes method.
bumping the version to 0.0.5.
bunch of refactoring.
- moved some methods to a module.
- bumped version to 0.1