Revert "Use the ip crate"

This reverts commit 5f84d3a817.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ipnetwork"
-version = "0.4.0"
+version = "0.5.0"
 authors = ["Abhishek Chanda <abhishe.becsk@gmail.com>"]
 description = "A library to work with IP CIDRs in Rust, heavily WIP"
 license = "Apache-2.0"
@@ -8,7 +8,6 @@ repository = "https://github.com/achanda/ipnetwork"
 
 [dependencies]
 clippy = {version = "0.0.37", optional = true}
-ip = "1.0.0"
 
 [features]
 default = []

src/lib.rs

@@ -2,14 +2,11 @@
 #![cfg_attr(feature = "dev", feature(plugin))]
 #![cfg_attr(feature = "dev", plugin(clippy))]
 #![crate_type = "lib"]
+#![feature(ip_addr)]
 #[allow(dead_code)]
 
-extern crate ip;
-
 use std::fmt;
-use std::net::{Ipv4Addr, Ipv6Addr};
-
-use ip::IpAddr;
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 
 // A network
 #[derive(Debug)]