Merge branch 'bump-gitlab-git' into 'master'

Bump gitlab_git to 7.1.1

Verify found object is actually a commit in Commit.find.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/1204

See merge request !1696

Gemfile

@@ -39,7 +39,7 @@ gem "browser"
 
 # Extracting information from a git repository
 # Provide access to Gitlab::Git library
-gem "gitlab_git", '7.1.0'
+gem "gitlab_git", '~> 7.1.0'
 
 # Ruby/Rack Git Smart-HTTP Server Handler
 gem 'gitlab-grack', '~> 2.0.0.rc2', require: 'grack'

Gemfile.lock

@@ -213,7 +213,7 @@ GEM
       mime-types (~> 1.19)
     gitlab_emoji (0.1.0)
       gemojione (~> 2.0)
-    gitlab_git (7.1.0)
+    gitlab_git (7.1.1)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.6)
       gitlab-linguist (~> 3.0)
@@ -709,7 +709,7 @@ DEPENDENCIES
   gitlab-grack (~> 2.0.0.rc2)
   gitlab-linguist (~> 3.0.1)
   gitlab_emoji (~> 0.1)
-  gitlab_git (= 7.1.0)
+  gitlab_git (~> 7.1.0)
   gitlab_meta (= 7.0)
   gitlab_omniauth-ldap (= 1.2.0)
   gollum-lib (~> 4.0.0)