refactor(Rail): update component

[layershifter]

This PR:

• updates docs to latest pattern (refactor(docs): rename file name to be the same as class name, etc #564);
• cleanups docs, tests and code;
• fixes bugs in docs:

[codecov-io]

Current coverage is 100% (diff: 100%)

No coverage report found for master at 89456fa.

Powered by Codecov. Last update 89456fa...4fe1025

[levithomason]

Released in [email protected]