Add Spree::Money#to_html (from Spree 2.0)

lib/spree/money_decorator.rb

@@ -9,4 +9,15 @@ Spree::Money.class_eval do
     @options[:no_cents] = true if @money.dollars % 1 == 0
     to_s
   end
+
+  def to_html(options = { :html => true })
+    output = @money.format(@options.merge(options))
+    if options[:html]
+      # 1) prevent blank, breaking spaces
+      # 2) prevent escaping of HTML character entities
+      output = output.sub(" ", " ").html_safe
+    end
+    output
+  end
+
 end