Update jsonrpc dependencies and rewrite dapps to futures. (#6522)

* Bump version.

* Fix RPC crate.

* Fix BoxFuture in crates.

* Compiles and passes tests!

* Get rid of .boxed()

* Fixing issues with the UI.

* Remove minihttp. Support threads.

* Reimplement files serving to do it in chunks.

* Increase chunk size.

* Remove some unecessary copying.

* Fix tests.

* Fix stratum warning and ipfs todo.

* Switch to proper branch of jsonrpc.

* Update Cargo.lock.

* Update docs.

* Include dapps-glue in workspace.

* fixed merge artifacts

* Fix test compilation.

ethcore/native_contracts/generator/src/lib.rs

@@ -46,10 +46,12 @@ pub fn generate_module(struct_name: &str, abi: &str) -> Result<String, Error> {
 
 	Ok(format!(r##"
 use byteorder::{{BigEndian, ByteOrder}};
-use futures::{{future, Future, IntoFuture, BoxFuture}};
+use futures::{{future, Future, IntoFuture}};
 use ethabi::{{Contract, Interface, Token, Event}};
 use bigint;
 
+type BoxFuture<A, B> = Box<Future<Item = A, Error = B> + Send>;
+
 /// Generated Rust bindings to an Ethereum contract.
 #[derive(Clone, Debug)]
 pub struct {name} {{
@@ -118,15 +120,14 @@ pub fn {snake_name}<F, U>(&self, call: F, {params}) -> BoxFuture<{output_type},
 
 	let call_future = match function.encode_call({to_tokens}) {{
 		Ok(call_data) => (call)(call_addr, call_data),
-		Err(e) => return future::err(format!("Error encoding call: {{:?}}", e)).boxed(),
+		Err(e) => return Box::new(future::err(format!("Error encoding call: {{:?}}", e))),
 	}};
 
-	call_future
+	Box::new(call_future
 		.into_future()
 		.and_then(move |out| function.decode_output(out).map_err(|e| format!("{{:?}}", e)))
 		.map(Vec::into_iter)
-		.and_then(|mut outputs| {decode_outputs})
-		.boxed()
+		.and_then(|mut outputs| {decode_outputs}))
 }}
 	"##,
 		abi_name = name,