separate trie from util and make its dependencies into libs:

* bytes
* hashdb
* memorydb
* nibbleslice
* nibblevec

dapps/src/apps/fetcher/mod.rs

@@ -261,7 +261,7 @@ impl<R: URLHint + 'static, F: Fetch> Fetcher for ContentFetcher<F, R> {
 mod tests {
 	use std::env;
 	use std::sync::Arc;
-	use util::Bytes;
+	use bytes::Bytes;
 	use fetch::{Fetch, Client};
 	use futures::{future, Future, BoxFuture};
 	use hash_fetch::urlhint::{URLHint, URLHintResult};

dapps/src/lib.rs

@@ -39,6 +39,7 @@ extern crate jsonrpc_http_server;
 
 extern crate ethcore_util as util;
 extern crate ethcore_bigint as bigint;
+extern crate ethcore_bytes as bytes;
 extern crate fetch;
 extern crate node_health;
 extern crate parity_dapps_glue as parity_dapps;

dapps/src/tests/helpers/registrar.rs

@@ -21,7 +21,8 @@ use rustc_hex::FromHex;
 
 use hash_fetch::urlhint::ContractClient;
 use bigint::hash::H256;
-use util::{Bytes, Address, ToPretty};
+use util::Address;
+use bytes::{Bytes, ToPretty};
 use parking_lot::Mutex;
 
 const REGISTRAR: &'static str = "8e4e9b13d4b45cb0befc93c3061b1408f67316b2";