Added wiki-page search for 5-2-stable, Fixed issue #4310

Created by: coverer

Since the master travis-ci build failed somehow, I applied the patch to a clean 5-2-stable and it works on our production machine.

You can now search for content in wiki pages. It gives the page, but not a snippet of the page, that may be a nice improvement for the future.

Gemfile

@@ -26,7 +26,7 @@ gem 'omniauth-github'
 gem 'gitlab_git', '~> 1.2.1'
 # Ruby/Rack Git Smart-HTTP Server Handler
-gem 'gitlab-grack', '~> 1.0.0', require: 'grack'
+gem 'gitlab-grack', '~> 1.0.1', require: 'grack'
 # LDAP Auth
 gem 'gitlab_omniauth-ldap', '1.0.2', require: "omniauth-ldap"