updated gradle wrapper to 1.9
Merge pull request #111 from radonsky/update_gradle_wrapper

updated gradle wrapper to 1.9
Merge branch 'master' of https://github.com/Netflix/SimianArmy into fix_build_issues_caused_by_deps

# Via Marek Radonsky (1) and coryb (1)
* 'master' of https://github.com/Netflix/SimianArmy:
  updated gradle wrapper to 1.9