Update gitlab_git to recent version

Gemfile

@@ -24,7 +24,7 @@ gem 'omniauth-github'
 # Extracting information from a git repository
 # Provide access to Gitlab::Git library
-gem "gitlab_git", "~> 3.0.0.rc1"
+gem "gitlab_git", "~> 3.0.0.rc2"
 # Ruby/Rack Git Smart-HTTP Server Handler
 gem 'gitlab-grack', '~> 1.0.1', require: 'grack'

Gemfile.lock

@@ -171,7 +171,7 @@ GEM
       stringex (~> 1.5.1)
     gitlab-grack (1.0.1)
       rack (~> 1.4.1)
-    gitlab-grit (2.6.0)
+    gitlab-grit (2.6.1)
       charlock_holmes (~> 0.6.9)
       diff-lcs (~> 1.1)
       mime-types (~> 1.15)
@@ -179,10 +179,10 @@ GEM
     gitlab-pygments.rb (0.3.2)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    gitlab_git (3.0.0.rc1)
+    gitlab_git (3.0.0.rc2)
       activesupport (~> 3.2.13)
       github-linguist (~> 2.3.4)
-      gitlab-grit (~> 2.6.0)
+      gitlab-grit (~> 2.6.1)
     gitlab_meta (6.0)
     gitlab_omniauth-ldap (1.0.3)
       net-ldap (~> 0.3.1)
@@ -581,7 +581,7 @@ DEPENDENCIES
   gitlab-gollum-lib (~> 1.0.1)
   gitlab-grack (~> 1.0.1)
   gitlab-pygments.rb (~> 0.3.2)
-  gitlab_git (~> 3.0.0.rc1)
+  gitlab_git (~> 3.0.0.rc2)
   gitlab_meta (= 6.0)
   gitlab_omniauth-ldap (= 1.0.3)
   gon