Patch review requested: Add XML namespace prefix to AR#to_xml

Hi, could someone please have a look at this patch:

[PATCH] Add XML namespace prefix option to ActiveRecord #to_xml

Proposed syntax is as follows:

firm.to_xml :namespace=> {:prefix => "contact", :name => "http://"}

<firm xmlns:contact="">
  # ... attributes ...

This change does not break the existing API.

Patch updated so that multiple namespaces can be passed in an Array:

firm.to_xml :namespace => ["",
{:prefix=>'isbn', :name=>'urn:ISBN:0-395-36341-6'}]

<firm xmlns="" xmlns:isbn="urn:ISBN:
  # ... normal attributes as shown above ...