Remove several unused imports

These managed to slip through the previous commit

Author: sgrif

diesel/src/pg/types/date_and_time/chrono.rs

@@ -7,10 +7,7 @@ use std::io::Write;
 use self::chrono::{Duration, NaiveDateTime, NaiveDate, NaiveTime};
 use self::chrono::naive::date;
 
-use expression::AsExpression;
-use expression::bound::Bound;
 use pg::Pg;
-use query_source::Queryable;
 use super::{PgDate, PgTime, PgTimestamp};
 use types::{self, Date, FromSql, IsNull, Time, Timestamp, ToSql};
 

diesel/src/pg/types/date_and_time/std_time.rs

@@ -2,10 +2,7 @@ use std::error::Error;
 use std::io::Write;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
-use expression::AsExpression;
-use expression::bound::Bound;
 use pg::Pg;
-use query_source::Queryable;
 use types::{self, ToSql, FromSql, IsNull};
 
 expression_impls! {

diesel_tests/tests/lib.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(feature = "unstable", feature(custom_derive, plugin, custom_attribute, time2))]
+#![cfg_attr(feature = "unstable", feature(custom_derive, plugin, custom_attribute))]
 #![cfg_attr(feature = "unstable", plugin(diesel_codegen, dotenv_macros))]
 
 extern crate quickcheck;

diesel_tests/tests/select.rs

@@ -147,7 +147,6 @@ fn selecting_columns_with_different_definition_order() {
 #[test]
 fn selection_using_subselect() {
     use schema::posts::dsl::*;
-    use diesel::expression::dsl::*;
 
     let connection = connection_with_sean_and_tess_in_users_table();
     let ids: Vec<i32> = users::table.select(users::id).load(&connection).unwrap();