Merge pull request #166 from Arcterus/master

md5sum: update rust-crypto
Merge pull request #167 from Arcterus/master

Fix travis
os::args returns Vec<~str> now
transmute moved to std::mem
growable ~[T] -> Vec<T>
from_base64 returns Vec<u8> now
base64: simplify ignore_garbage
env: os.arg() returns Vec<~str> now
env: adapt to new Process API
Merge pull request #168 from ebfe/fix-build-master

Fix build with rust master
add comm
Merge pull request #169 from ebfe/comm

add comm
add cksum
Merge pull request #170 from ebfe/cksum

add cksum
Add unlink command.
Merge pull request #171 from zvms/add-unlink

Add unlink command.
Update for getopts changes
Update tests to use std::process:Command
Merge pull request #172 from ebfe/strbuf-getopts

Update for getopts changes
Merge pull request #173 from ebfe/fix-make-test

Update tests to use std::process:Command