i-o

i-o is used at run time in 8 crates.

Number of dependers	i-o version	Downloads/month
7	0.4.7	23
1	0.2.2	0

Depender (with downloads and own rev deps)			i-o version
180	5	unix		^0.4
	2	unix-tty		^0.4
		libreal		^0.2
		eloggr		^0.4
		loggr		^0.4
	1	cursebox		^0.4.3
	1	buf		^0.4