echo: handle -- correctly
Merge pull request #281 from ebfe/uutils

uutils: add fmt, sync
Merge pull request #283 from ebfe/uutils

uutils: fix build
echo: fix handling of \0
echo: pass Busybox test suite
Merge pull request #280 from Arcterus/echo-fix

Make echo pass the Busybox test suite
move rust-crypto to deps/
md5sum: remove Makefile
uutils: add md5sum