Bring integer arithmetic up to crates.io (#3943)

* split initial

* decouple crate

* fix tests compilation

* fix rlp tests

util/rlp/src/bytes.rs

@@ -21,8 +21,7 @@ use std::mem;
 use std::fmt;
 use std::cmp::Ordering;
 use std::error::Error as StdError;
-use bigint::uint::{Uint, U128, U256};
-use bigint::hash::{H64, H128, H160, H256, H512, H520, H2048};
+use bigint::prelude::{Uint, U128, U256, H64, H128, H160, H256, H512, H520, H2048};
 use elastic_array::*;
 
 /// Vector like object

util/rlp/src/rlpin.rs

@@ -163,7 +163,7 @@ impl<'a, 'view> Iterator for RlpIterator<'a, 'view> {
 #[test]
 fn break_it() {
 	use rustc_serialize::hex::FromHex;
-	use bigint::uint::U256;
+	use bigint::prelude::U256;
 
 	let h: Vec<u8> = FromHex::from_hex("f84d0589010efbef67941f79b2a056e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421a0c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470").unwrap();
 	let r: Rlp = Rlp::new(&h);

util/rlp/src/tests.rs

@@ -17,7 +17,7 @@
 use std::{fmt, cmp};
 use std::str::FromStr;
 use ::{Encodable, RlpDecodable, UntrustedRlp, RlpStream, View, Stream, DecoderError};
-use bigint::uint::U256;
+use bigint::prelude::U256;
 
 #[test]
 fn rlp_at() {