Do not expose sha3 from crypto

src/network/discovery.rs

@@ -8,6 +8,7 @@ use std::ops::{DerefMut};
 use mio::*;
 use mio::udp::*;
 use hash::*;
+use sha3::Hashable;
 use crypto::*;
 use network::host::*;
 

src/network/handshake.rs

@@ -1,6 +1,7 @@
 use mio::*;
 use mio::tcp::*;
 use hash::*;
+use sha3::Hashable;
 use bytes::Bytes;
 use crypto::*;
 use crypto;

src/network/host.rs

@@ -8,6 +8,7 @@ use mio::tcp::*;
 use mio::udp::*;
 use hash::*;
 use crypto::*;
+use sha3::Hashable;
 use rlp::*;
 use time::Tm;
 use network::handshake::Handshake;