Make test-client generic over runtime (#2824)

* Make test-client generic over runtime.

* Make sure genesis storage is constructed correctly.

* Use prelude in tests.

* Add an example of how to use test-client with node/runtime.

* Bump version.

* Rename test-clients.

substrate/core/sr-api-macros/tests/runtime_calls.rs

@@ -15,8 +15,8 @@
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
 use test_client::{
-	AccountKeyring, runtime::{TestAPI, DecodeFails, Transfer, Header},
-	NativeExecutor, LocalExecutor, TestClientBuilder
+	prelude::*,
+	runtime::{TestAPI, DecodeFails, Transfer, Header},
 };
 use runtime_primitives::{
 	generic::BlockId,
@@ -190,4 +190,4 @@ fn record_proof_works() {
 		"Core_execute_block",
 		&block.encode(),
 	).expect("Executes block while using the proof backend");
-}
+}