Improve Mikyung's Scenario engine

For the time being, I did a cosmetic change to Mikyung: make it more modular and organized similar to Cucumber.

So now you will have this structure:

steps/
  buying_process.rb
scenarios/
  buying_process.scenario
buying_process.rb

The patch to implement this is here: http://github.com/akitaonrails/restfulie/commit/6f0c1ed17cfe91ae747...

And the example of usage is here:
http://github.com/akitaonrails/restfulie-full-examples/commit/cd549...

pulled

Nope. This is different from the reorganization of the steps/scenario files. The current parser is just a concatenator for method missing, which won't work well if you use reserved keyword like "for". I just registered this ticket because I want to investigate adding Cucumber's parser into Mikyung later.

[bulk edit]