fix resicpes to point 5-0-stable branch

doc/install/installation.md

@@ -208,7 +208,7 @@ 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/5-0-stable/init.d/gitlab
     sudo chmod +x /etc/init.d/gitlab
 Make GitLab start on boot:
@@ -249,7 +249,7 @@ 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/5-0-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: