Create a DLR backend

[Chuck]

Create a DLR-only backend for Cobra. This would be useful for embedding Cobra, for making an interpreted version of it, for making an interactive prompt (a la LISP and Python) and for exploring the pros and cons of DLR vs. CLR.

There is an article at  http://www.dotnetguru.org/us/dlrus/DLR2.htm on this topic.