Allow ActiveRecord XML Serialization to use CamelCase names

I've been working on a project that needed some ActiveRecord -> XML conversion, but they have standardized on CamelCased names in their XML. I created a patch adding a :camelize option and added it to Lighthouse since I figured I'm probably not alone:   #1534 Allow ActiveRecord XML Serialization to use CamelCase names - Ruby on Rails - rails

I've included tests and the patch does round trip to_xml and from_xml with CamelCased names. Anyone willing to take a look/provide feedback? Thanks, Bruce