Bumping clippy. Fixing warnings (#1139)

* Bumping clippy. Fixing warnings

* Removing unused import

* Fixing complexity and arguments warning on two functions

ethcore/Cargo.toml

@@ -22,7 +22,7 @@ ethcore-util = { path = "../util" }
 evmjit = { path = "../evmjit", optional = true }
 ethash = { path = "../ethash" }
 num_cpus = "0.2"
-clippy = { version = "0.0.67", optional = true}
+clippy = { version = "0.0.69", optional = true}
 crossbeam = "0.2.9"
 lazy_static = "0.1"
 ethcore-devtools = { path = "../devtools" }

ethcore/src/trace/error.rs

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-//! TraceDB errors.
+//! `TraceDB` errors.
 
 use std::fmt::{Display, Formatter, Error as FmtError};
 
@@ -26,7 +26,7 @@ To do this, remove or move away your current database and restart parity. e.g.:
 > mv ~/.parity/906a34e69aec8c0d /tmp
 > parity";
 
-/// TraceDB errors.
+/// `TraceDB` errors.
 #[derive(Debug)]
 pub enum Error {
 	/// Returned when tracing is enabled,

ethcore/src/views.rs

@@ -320,7 +320,6 @@ impl<'a> Hashable for HeaderView<'a> {
 #[cfg(test)]
 mod tests {
 	use rustc_serialize::hex::FromHex;
-	use util::rlp::View;
 	use super::BlockView;
 
 	#[test]