Add users to /:id route

So now when you type site/:username it redirects you to users page.
And if you type site/:groupname it redirects you to group page
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/namespaces_controller.rb

+class NamespacesController < ApplicationController
+  skip_before_filter :authenticate_user!
+
+  def show
+    namespace = Namespace.find_by(path: params[:id])
+
+    unless namespace
+      return render_404
+    end
+
+    if namespace.type == "Group"
+      redirect_to group_path(namespace)
+    else
+      redirect_to user_path(namespace.owner)
+    end
+  end
+end
+

config/routes.rb

@@ -315,7 +315,7 @@ Gitlab::Application.routes.draw do
     end
   end
 
-  get ':id' => "groups#show", constraints: {id: /(?:[^.]|\.(?!atom$))+/, format: /atom/}
+  get ':id' => "namespaces#show", constraints: {id: /(?:[^.]|\.(?!atom$))+/, format: /atom/}
 
   root to: "dashboard#show"
 end