try to use stable version for database cleaner

Gemfile

@@ -144,7 +144,7 @@ group :development, :test do
   gem "capybara", '2.0.2'
   gem "pry"
   gem "awesome_print"
-  gem "database_cleaner", ref: "9f898fc50d87a5d51760f9dcf374bf5ffda21baf", git: "https://github.com/bmabey/database_cleaner.git"
+  gem "database_cleaner"
   gem "launchy"
   gem 'factory_girl_rails'

Gemfile.lock

-GIT
-  remote: https://github.com/bmabey/database_cleaner.git
-  revision: 9f898fc50d87a5d51760f9dcf374bf5ffda21baf
-  ref: 9f898fc50d87a5d51760f9dcf374bf5ffda21baf
-  specs:
-    database_cleaner (0.9.1)
-
 GIT
   remote: https://github.com/ctran/annotate_models.git
   revision: be4e26825b521f0b2d86b181e2dff89901aa9b1e
@@ -133,6 +126,7 @@ GEM
     connection_pool (1.0.0)
     crack (0.3.1)
     daemons (1.1.9)
+    database_cleaner (0.9.1)
     debug_inspector (0.0.2)
     devise (2.1.2)
       bcrypt-ruby (~> 3.0)
@@ -474,7 +468,7 @@ DEPENDENCIES
   chosen-rails (= 0.9.8)
   coffee-rails (~> 3.2.2)
   colored
-  database_cleaner!
+  database_cleaner
   devise (~> 2.1.0)
   draper (~> 0.18.0)
   email_spec

features/steps/project/project_merge_requests.rb

@@ -84,11 +84,11 @@ class ProjectMergeRequests < Spinach::FeatureSteps
   end
   And 'I switch to the diff tab' do
-    visit diffs_project_merge_request_path(merge_request.project, merge_request)
+    visit diffs_project_merge_request_path(project, merge_request)
   end
   And 'I switch to the merge request\'s comments tab' do
-    visit project_merge_request_path(merge_request.project, merge_request)
+    visit project_merge_request_path(project, merge_request)
   end
   And 'I click on the first commit in the merge request' do

features/support/env.rb

@@ -34,6 +34,7 @@ Spinach.hooks.before_scenario do
   Gitlab.config.gitlab_shell.stub(repos_path: Rails.root.join('tmp', 'test-git-base-path'))
   FileUtils.rm_rf Gitlab.config.gitlab_shell.repos_path
   FileUtils.mkdir_p Gitlab.config.gitlab_shell.repos_path
+  DatabaseCleaner.start
 end
 Spinach.hooks.after_scenario do