Merge pull request #18 from ashleyh/master

reduce merge pain of Makefile
Implement dirname
Remove dirname from to-do list
rust println supports multi-line ...
Merge pull request #23 from Heather/master

rust println supports multi-line ...
Remove unnecessary escaping
Merge pull request #22 from derekchiang/add-dirname

Implement dirname
simple pwd implementation
Merge pull request #25 from Heather/master

simple pwd implementation
init -> new (reverted in rust)
from_utf8_slice -> from_utf8
Merge pull request #27 from Heather/master

Apply rust language updates from 2013-12-05
hostname in progress
Merge pull request #30 from alanandrade/master

hostname in progress
Head in progress
Merge pull request #32 from alanandrade/master

Head in progress
process status returns Option now
Merge pull request #35 from Heather/master

process status returns Option now
Specify target version, fixes #26
Implemented rmdir, which fixes #37
Added the aliases -h and -V for --help and --version to rmdir