simple_wal

simple_wal is used at run time in 5 crates. It is a direct run-time dependency in 4 crates.

Depender (with downloads and own rev deps)			simple_wal version
		disk_log		^0.3.0
	1	darkbird		^0.3.0
		diskfire		^0.3.0
		rstorage		^0.3.0