Stop glob importing from sqlite::connection::mod

This is due to some apparent changes in Rust nightly that is causing the
`extern crate` definitions to conflict with each other. Unfortunately,
we still don't compile on nightly as a result of
rust-lang/rust#31487, but this is an easy win.

diesel/src/sqlite/connection/mod.rs

@@ -17,9 +17,9 @@ use query_builder::*;
 use query_source::*;
 use result::*;
 use result::Error::QueryBuilderError;
-use self::raw::*;
+use self::raw::RawConnection;
 use self::statement_iterator::StatementIterator;
-use self::stmt::*;
+use self::stmt::Statement;
 use sqlite::Sqlite;
 use super::query_builder::SqliteQueryBuilder;
 use types::HasSqlType;