Futures-based native wrappers for contract ABIs (#5341)

* initial native contract generator

* get generated code compiling

* unit tests for type codegen

* autogenerate registry contract

* native_contracts entry for registry

* service_transaction_checker

* fixed indentation

ethcore/src/client/mod.rs

@@ -16,7 +16,6 @@
 
 //! Blockchain database client.
 
-mod registry;
 mod config;
 mod error;
 mod test_client;