[Yaml-core] Patch for yaml4r/syck implicit typing

[Sean O'D. <se...@ce...>]

Is anyone interested in this patch?  I don't want to just throw it to the 
mailing list, but I needed this and I thought perhaps others would as well.  
This is just for yaml4r.  It lets you load scalars as any native type you 
choose based on a scalars value, and is completely aside from the 
specification.  This is just a library feature; if you use it, you completely 
override how native objects are loaded.  If you handle loading a scalar, the 
Ruby native types and the explicit typing mechanisms are bypassed utterly.  
It lets you use syntax like this:

  YAML.add_implicit_transfer_handler(/^ohyeah$/) do | val |
    true
  end

...so any scalars with a raw string value of "ohyeah" are turned into the 
native Ruby type "true."

Should I just post the patch to the mailing list?  It's small at 7KB.

	Sean O'Dell