Fix version mismatch for installations docs

doc/install/installation.md

@@ -132,10 +132,10 @@ To setup the MySQL/PostgreSQL database and dependencies please see [`doc/install
     cd /home/git/gitlab
     # Checkout to stable release
-    sudo -u git -H git checkout 5-0-stable
+    sudo -u git -H git checkout 5-1-stable
 **Note:**
-You can change `5-0-stable` to `master` if you want the *bleeding edge* version, but
+You can change `5-1-stable` to `master` if you want the *bleeding edge* version, but
 do so with caution!
 ## Configure it
@@ -200,7 +200,7 @@ Make sure to update username/password in config/database.yml.
 Download the init script (will be /etc/init.d/gitlab):
-    sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlab-recipes/master/init.d/gitlab
+    sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlab-recipes/5-1-stable/init.d/gitlab
     sudo chmod +x /etc/init.d/gitlab
 Make GitLab start on boot:
@@ -241,7 +241,7 @@ If you can't or don't want to use Nginx as your web server, have a look at the
 Download an example site config:
-    sudo curl --output /etc/nginx/sites-available/gitlab https://raw.github.com/gitlabhq/gitlab-recipes/master/nginx/gitlab
+    sudo curl --output /etc/nginx/sites-available/gitlab https://raw.github.com/gitlabhq/gitlab-recipes/5-1-stable/nginx/gitlab
     sudo ln -s /etc/nginx/sites-available/gitlab /etc/nginx/sites-enabled/gitlab
 Make sure to edit the config file to match your setup: