Change the user search query to be case insensitive.

CHANGELOG

 v 6.8.0
   - Ability to at mention users that are participating in issue and merge req. discussion
   - Enabled GZip Compression for assets in example Nginx, make sure that Nginx is compiled with --with-http_gzip_static_module flag (this is default in Ubuntu)
+  - Make user search case-insensitive (Christopher Arnold)
 v 6.7.2
   - Fix upgrader script

app/models/user.rb

@@ -204,7 +204,7 @@ class User < ActiveRecord::Base
     end
     def search query
-      where("name LIKE :query OR email LIKE :query OR username LIKE :query", query: "%#{query}%")
+      where("lower(name) LIKE :query OR lower(email) LIKE :query OR lower(username) LIKE :query", query: "%#{query.downcase}%")
     end
     def by_username_or_id(name_or_id)