Add integration tests

[skeleton]

• [x] Install HautelookAlice bundle & DoctrineDataFixtures to generate fixtures
• [x] Create configuration for test environment to allow a static connexion with http_basic
• [x] Create tests for Adventure
  • [x] Create an adventure
  • [x] Tests constaints on a adventure entity
  • [x] Delete an adventure
  • [x] Update an adventure to delete a step
  • [x] Delete an adventure when a steps are linked to badges
  • [x] Accept an adventure step
  • [x] Reject an adventure step
• [x] Create tests for Badge
  • [x] Create a new badge
  • [x] Delete a badge
  • [x] Delete a badge when it has been claimed
  • [x] Delete a badge when it has been unlocked
• [x] Tests on Unlocker
  • [x] Unlock a badge
  • [x] Do nothing if badge has already been unlocked
  • [x] Unlock a badge from a claim
• [x] Remove deprecated calls
• [x] Launch tests on travis