Remove serialization features

* Remove rule load adapters
* Remove rule storage
* Remove params from initialization
* Remove to_hash and from_hash methods
* Few refactors based on Ruby styleguide
Merge pull request #18 from migl/remove_serialization

Remove serialization features
Remove metadata code
Merge pull request #19 from migl/remove_metadata

Remove metadata code
Remove unnecessary method_missing definition
Merge pull request #20 from migl/cleanup

Remove unnecessary method_missing definition