Render appearance changes. Show appearance tab in admin area

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/appearances.js.coffee

+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/application.scss

@@ -72,6 +72,7 @@
 @import "sections/dashboard.scss";
 @import "sections/stat_graph.scss";
 @import "sections/groups.scss";
+@import "sections/appearances.scss";
 
 /**
  * Code highlight

app/assets/stylesheets/sections/appearances.scss

+.appearance-logo-preview {
+  max-width: 400px;
+  margin-bottom: 20px;
+}

app/helpers/brand_helper.rb → app/helpers/appearances_helper.rb

-module BrandHelper
+module AppearancesHelper
   def brand_title
-    'GitLab Enterprise Edition'
+    if brand_item
+      brand_item.title
+    else
+      'GitLab Enterprise Edition'
+    end
   end
 
   def brand_image
-    image_tag 'brand_logo.png'
+    logo = if brand_item
+             brand_item.logo
+           else
+             'brand_logo.png'
+           end
+
+    image_tag logo
   end
 
   def brand_text
@@ -18,6 +28,18 @@ Each project can also have an issue tracker and a wiki.
 Used by more than 50,000 organizations, GitLab is the most popular solution to manage git repositories on-premises.
 Read more about GitLab at #{link_to "www.gitlab.com", "https://www.gitlab.com/", target: "_blank"}.
 eos
-    markdown default_text
+
+
+    text = if brand_item
+             brand_item.description
+           else
+             default_text
+           end
+
+    markdown text
+  end
+
+  def brand_item
+    @appearance ||= Appearance.first
   end
 end

app/views/layouts/nav/_admin.html.haml

@@ -16,4 +16,5 @@
     = link_to "Hooks", admin_hooks_path
   = nav_link(controller: :background_jobs) do
     = link_to "Background Jobs", admin_background_jobs_path
-
+  = nav_link(controller: :appearances) do
+    = link_to "Appearance", admin_appearances_path

config/routes.rb

@@ -100,6 +100,8 @@ Gitlab::Application.routes.draw do
       end
     end
 
+    resource :appearances
+
     root to: "dashboard#index"
   end