Deimos organization

[Matt Soucy]

I've been messing around with Deimos lately, and I was a little bit 
confused about some of the design.
I saw that a couple (ZeroMQ, ncurses) didn't follow the usual structure 
of having a c/ and a deimos/ folder. Is this by design, or is it 
something that should be remedied?

Other things I was unsure about:
libmysql, libc, libruby, lua don't have any D files at all - some are 
just READMEs. Are these still under development?
libexif goes libexif/libexif/(d files) instead of 
libexif/deimos/libexif/(d files). Also by design?

Thank you,
Matt