Use new gitlab_git revision

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Gemfile

@@ -29,7 +29,7 @@ gem 'omniauth-github'
 
 # Extracting information from a git repository
 # Provide access to Gitlab::Git library
-gem "gitlab_git", git: 'https://gitlab.com/gitlab-org/gitlab_git.git', ref: '53f5faf'
+gem "gitlab_git", git: 'https://gitlab.com/gitlab-org/gitlab_git.git', ref: '39bc4f043414f1e49f802ed633fa20e6400bfa49'
 
 # Ruby/Rack Git Smart-HTTP Server Handler
 gem 'gitlab-grack', '~> 2.0.0.pre', require: 'grack'

Gemfile.lock

@@ -7,8 +7,8 @@ GIT
 
 GIT
   remote: https://gitlab.com/gitlab-org/gitlab_git.git
-  revision: 53f5faf462f2773619179222a70247f051ee13df
-  ref: 53f5faf
+  revision: 39bc4f043414f1e49f802ed633fa20e6400bfa49
+  ref: 39bc4f043414f1e49f802ed633fa20e6400bfa49
   specs:
     gitlab_git (5.1.0.pre)
       activesupport (~> 4.0.0)