Refactor to follow the upper part of the refactor diagram on #77
Expect to fail until --verbose option activated
Rename poicy_loader to policy_registry

because the class does not load policies, but it just stores policies
Rename EncodingDetectionError to DecodingError
Activate --verbose option
Fix UnboundLocalError
Make developers-friendly policy status log
Add tests for CLI
Merge pull request #78 from Kuniwak/refactor-1st

Refactor 1st