Merge pull request #30 from ozkriff/master

Updated to latest Rust, fixed warnings
libc is now an extern crate.
Merge pull request #34 from sebcrozet/libc

libc is now an extern crate.
Update .gitignore
Merge pull request #35 from hannobraun/master

Update .gitignore
~str -> &Path
Merge pull request #37 from ozkriff/str_to_path

~str -> &Path
Updated for latest Rust: ~"" -> "".to_owned()