[Feature Request] Forwardable as Ruby does

[bioinfornatics]

dear,
I would like a easy way to forward as does ruby:
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/forwardable/rdoc/Forwardable.html

I have already something close: 
- https://gist.github.com/1969776 (me)
- http://paste.pocoo.org/show/uoD89CCjX5H3m6GvPvW6/ (dav1d)

But it works only for array.


I have try to do this purpose: https://gist.github.com/1974033

but i am too new in D

This feature will be really awesome and could be go into std.traits