Vendor dependencies

Let's see how I like this workflow.

vendor/users/examples/os.rs

@@ -0,0 +1,38 @@
+extern crate users;
+use users::{Users, Groups, UsersCache};
+use users::os::unix::{UserExt, GroupExt};
+//use users::os::bsd::UserExt as BSDUserExt;
+
+extern crate env_logger;
+
+
+fn main() {
+    env_logger::init();
+
+	let cache = UsersCache::new();
+
+	let current_uid = cache.get_current_uid();
+	println!("Your UID is {}", current_uid);
+
+	let you = cache.get_user_by_uid(current_uid).expect("No entry for current user!");
+	println!("Your username is {}", you.name().to_string_lossy());
+	println!("Your shell is {}", you.shell().display());
+	println!("Your home directory is {}", you.home_dir().display());
+
+    // The two fields below are only available on BSD systems.
+    // Linux systems don’t have the fields in their `passwd` structs!
+    //println!("Your password change timestamp is {}", you.password_change_time());
+    //println!("Your password expiry timestamp is {}", you.password_expire_time());
+
+	let primary_group = cache.get_group_by_gid(you.primary_group_id()).expect("No entry for your primary group!");
+	println!("Your primary group has ID {} and name {}", primary_group.gid(), primary_group.name().to_string_lossy());
+
+	if primary_group.members().is_empty() {
+		println!("There are no other members of that group.");
+	}
+	else {
+		for username in primary_group.members() {
+			println!("User {} is also a member of that group.", username.to_string_lossy());
+		}
+	}
+}