Fix the nightly build

Nightly uses a different (but backward compatible) version of rustfmt.

src/accountant.rs

@@ -259,9 +259,9 @@ impl Accountant {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use signature::KeyPairUtil;
-    use hash::hash;
     use bincode::serialize;
+    use hash::hash;
+    use signature::KeyPairUtil;
 
     #[test]
     fn test_accountant() {
@@ -412,9 +412,9 @@ mod bench {
     extern crate test;
     use self::test::Bencher;
     use accountant::*;
-    use signature::KeyPairUtil;
-    use hash::hash;
     use bincode::serialize;
+    use hash::hash;
+    use signature::KeyPairUtil;
 
     #[bench]
     fn process_verified_event_bench(bencher: &mut Bencher) {

src/accountant_skel.rs

@@ -4,9 +4,9 @@
 
 use accountant::Accountant;
 use bincode::{deserialize, serialize};
+use ecdsa;
 use entry::Entry;
 use event::Event;
-use ecdsa;
 use hash::Hash;
 use historian::Historian;
 use packet;

src/ecdsa.rs

@@ -8,9 +8,9 @@ use std::mem::size_of;
 #[cfg(not(feature = "cuda"))]
 use rayon::prelude::*;
 #[cfg(not(feature = "cuda"))]
-use untrusted;
-#[cfg(not(feature = "cuda"))]
 use ring::signature;
+#[cfg(not(feature = "cuda"))]
+use untrusted;
 
 // Shared imports
 use packet::{Packet, SharedPackets};

src/lib.rs

@@ -2,9 +2,9 @@
 pub mod accountant;
 pub mod accountant_skel;
 pub mod accountant_stub;
+pub mod ecdsa;
 pub mod entry;
 pub mod event;
-pub mod ecdsa;
 pub mod hash;
 pub mod historian;
 pub mod ledger;