Add a CSS Style string to tracks by request of @krokodilerian

app/controllers/management/conferences_controller.rb

@@ -56,7 +56,7 @@ module Management
         event_types_attributes: [:id, :name, :description, :maximum_length,
                                  :minimum_length, :_destroy],
         tracks_attributes: [:id, :name, :color, :css_class, :description,
-                            :_destroy],
+                            :css_style, :_destroy],
         halls_attributes: [:id, :name, :_destroy],
         volunteer_teams_attributes: [:id, :name, :description, :color, :_destroy]
       )

app/views/management/conferences/_form_tracks.html.slim

@@ -11,6 +11,7 @@ div#tracks
           = ff.input :name
           = ff.input :color, as: :color
           = ff.input :css_class
+          = ff.input :css_style
           = ff.input :description
 .col-lg-6
   .panel.panel-default

db/migrate/20151018105806_add_css_style_string_to_tracks.rb

@@ -0,0 +1,5 @@
+class AddCssStyleStringToTracks < ActiveRecord::Migration
+  def change
+    add_column :tracks, :css_style, :text
+  end
+end