Refactor of the feature step, reporting and fix for the multiline background steps.

Based on the #79 and #80. There was some refactoring needed to preserve the reporting functionality.
Also removed other entry points for the "generation", "cucumber_json" and "reporting" so now it shows "bdd" on the start only once for the plugin.
It is mutable.         self.example_params.append(param) in the same class