Update todo.
Extended header states to accept message and code.
Extend builder XSL to add message and code on header states.
Update optimizations to be aware of code/message attributes on header steps.
Added support for code/message in header state (state, and builder)
Added step tests to cover message and code in header steps.
Fixed bug where message was accidently placed in code attribute.
Added builder tests for header code/message attributes.
Added validator tests for rax:message rax:code on header params.
Merge pull request #127 from InABlender/header_code

Enable rax:message and rax:code in Header errors