Add support for model migrations

src/table/lib.rs

@@ -3,9 +3,11 @@
 #[macro_use]
 extern crate log;
 
+pub mod schema;
 pub mod table;
 pub mod table_fullcopy;
 pub mod table_sharded;
 pub mod table_sync;
 
 pub use table::*;
+pub use schema::*;