Step registration syntax is ugly

[acmcarther]

From https://github.com/acmcarther/cucumber/blob/master/features/cuke.rs#L20:

  cucumber::start(
    CucumberWorld::new(),
    &[
      &project_steps::register_steps,
    ]
  );

To a newcomer to rust (well, to anyone with eyeballs really), this looks obtuse for two reasons:

1. &[] syntax is obnoxious
2. Passing in registration functions is weird.

Maybe just update the examples to demo registering the steps manually, and add a macro to register them more terse-ly?

[pJunger]

How about a fluent interface for 1.? Something like this?

[acmcarther]

Ah that looks awesome! Much more consistent behavior. Can you put up a pull request with that content?

A lot of random test might break. I can help in fixing them if you'd like.

[pJunger]

I can start a pr, but I cannot promise anything further for the next to weeks.