Request/reqwest improvements

- Use json macro to simplify request builds
- Add proxy option for reqwest to use TLS
- Add rpc port options for configured nodes

src/lib.rs

@@ -94,6 +94,7 @@ extern crate ring;
 extern crate serde;
 #[macro_use]
 extern crate serde_derive;
+#[macro_use]
 extern crate serde_json;
 extern crate sha2;
 extern crate socket2;