Merge pull request #768 from SirRade/patch-1

Remove superfluous uses
diff --git a/diesel/src/query_source/joins.rs b/diesel/src/query_source/joins.rs
index fccf96a..a435a19 100644
--- a/diesel/src/query_source/joins.rs
+++ b/diesel/src/query_source/joins.rs
@@ -1,9 +1,6 @@
 use prelude::*;
-use expression::SelectableExpression;
 use expression::nullable::Nullable;
 use query_builder::*;
-use result::QueryResult;
-use super::{QuerySource, Table};
 use types::IntoNullable;
 
 #[derive(Debug, Clone, Copy)]