Merge pull request #1 from anshulmalvi/master

First cut with Circat/Netlist.hs which enables Circuit to Verilog netlist conversion.
exports, :~>
Merge branch 'master' of github.com:conal/circat

Conflicts:
	src/Circat/Circuit.hs

merged a few small tweaks with Anshul's changes
Some code tidying.
TODO (printf)
TODO (failure alternative for displaying)
exports
.cabal: git repo and tidying