Change package name to du-dust

The binary is still called dust. Sadly dust was taken on crates.io.
This change should allow us to send this crate to crates.io

src/display.rs

@@ -1,7 +1,8 @@
 extern crate ansi_term;
 
 use self::ansi_term::Colour::Fixed;
-use dust::Node;
+
+use lib::Node;
 
 static UNITS: [char; 4] = ['T', 'G', 'M', 'K'];
 

src/main.rs

@@ -1,14 +1,15 @@
 #[macro_use]
 extern crate clap;
 extern crate assert_cli;
-extern crate dust;
 
 use self::display::draw_it;
 use clap::{App, AppSettings, Arg};
 use utils::{find_big_ones, get_dir_tree};
 
+
 mod display;
 mod utils;
+mod lib;
 
 static DEFAULT_NUMBER_OF_LINES: &'static str = "15";
 

src/utils/mod.rs

@@ -2,9 +2,9 @@ use std::collections::HashSet;
 
 use std::fs;
 
-use dust::Node;
 use std::path::Path;
 
+use lib::Node;
 mod platform;
 use self::platform::*;