Update compiler (#725)

* update compiler to recent nightly

* cargo fmt

* fix clippy

but ructe code is still complaining

* update circleci and rocket_csrf

* fix last clippy problems

* cargo fmt

* fix build issue

was caused be improper handling of recursive template (comment) by old ructe, which is fixed on newer version

plume-models/src/db_conn.rs

@@ -73,5 +73,4 @@ pub(crate) mod tests {
             Ok(conn.begin_test_transaction().unwrap())
         }
     }
-
 }