Add concept waiter section

app/assets/javascripts/waiter/app/routes/application_route.js.coffee

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+App.ApplicationRoute = Ember.Route.extend
+  setupController: ->
+    @controllerFor('product_categories').set 'model', @store.find('product_category')

app/assets/javascripts/waiter/app/routes/index_route.js.coffee

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+App.IndexRoute = Ember.Route.extend
+  redirect: -> @transitionTo('sections')

app/assets/javascripts/waiter/app/routes/sections_route.js.coffee

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+App.SectionsRoute = Ember.Route.extend
+  model: -> @store.find('section')