Add scenario selection with only one scenario available as a MVP.

[fierfeu]

the only scenario available will be scenario "Default" wich will serve as a base for the next tutorial first sceanrio.

• define a new class for scenario management
  • Select a scenario from a list
  • load JSON
  • get JSON datas
• let the game using it to select default scenario with a list with only one scenario
• verify that creation process still running well

[fierfeu]

During this issue update I move from protractor to selenium-webdriver to keep code as simple as possible.
And by this I'll be able to easilly calculate coverage for all mocha tests (units and e2e)

[fierfeu]

still have trouble with webdriver.actions()