add dark solarized theme for code preview

db/migrate/20130315124931_user_color_scheme.rb

@@ -0,0 +1,12 @@
+class UserColorScheme < ActiveRecord::Migration
+  def up
+    add_column :users, :color_scheme_id, :integer, null: false, default: 1
+    User.where(dark_scheme: true).update_all(color_scheme_id: 2)
+    remove_column :users, :dark_scheme
+  end
+
+  def down
+    add_column :users, :dark_scheme, :boolean, null: false, default: false
+    remove_column :users, :color_scheme_id
+  end
+end