New GDMD Project.

[Iain Buclaw]

I'm going to let this one go in gdc.  The gdmd perl script that 
provides as a front-end / conversion between dmd-style options 
and gdc-style options is being moved into a separate repository.

https://github.com/D-Programming-GDC/GDMD

This is to allow anyone who wants to, to improve upon it, or 
re-write it in D.

If anyone wants to take over the job, please give me an email or 
bell.


Thanks
Iain.