WIP on chain heap (#639)

* move heap size on chain

* fix the interface change

* decode heap size

* fix code comments

* fix comment

* update Cargo.lock

* rename to heappages

* add one heap pages variable in runtime

substrate/demo/cli/src/lib.rs

@@ -155,7 +155,7 @@ pub fn run<I, T>(args: I) -> error::Result<()> where
 	init_logger(log_pattern);
 
 	// Create client
-	let executor = NativeExecutor::with_heap_pages(8);
+	let executor = NativeExecutor::new();
 
 	let god_key = hex!["3d866ec8a9190c8343c2fc593d21d8a6d0c5c4763aaab2349de3a6111d64d124"];
 	let genesis_config = GenesisConfig {