Set git user info during arbua tests

Because the HOME directory is reset for these tests git would not use
an existing global configuration. Write the user.name and user.email
into the testing home directory, so valid value will be present when
committing during the integration tests.

test/integration/test_helper.rb

@@ -56,6 +56,10 @@ def before_setup
     FileUtils.rm_rf(current_dir)
     set_env('HOME', abs_current_dir)
     GitFactory.working_directory = abs_current_dir
+
+    FileUtils.mkdir_p(abs_current_dir)
+    Rugged::Config.global['user.name']  = GitFactory.users[0][:name]
+    Rugged::Config.global['user.email'] = GitFactory.users[0][:email]
   end
 
   def teardown