Support setting referent properties via attributes (#843)

Co-authored-by: Kenneth Loeffler <kenloef@gmail.com>

src/lib.rs

@@ -16,6 +16,7 @@ mod multimap;
 mod path_serializer;
 mod project;
 mod resolution;
+mod rojo_ref;
 mod serve_session;
 mod session_id;
 mod snapshot;
@@ -23,5 +24,6 @@ mod snapshot_middleware;
 mod web;
 
 pub use project::*;
+pub use rojo_ref::*;
 pub use session_id::SessionId;
 pub use web::interface as web_api;