Compiler warnings 20190123 (#2462)

* cleanup compiler warnings: unused imports

* rustfmt

* more compiler warnings

api/src/handlers/blocks_api.rs

@@ -140,7 +140,7 @@ impl Handler for BlockHandler {
 				return response(
 					StatusCode::BAD_REQUEST,
 					format!("failed to parse input: {}", e),
-				)
+				);
 			}
 			Ok(h) => h,
 		};

api/src/handlers/peers_api.rs

@@ -85,7 +85,7 @@ impl Handler for PeerHandler {
 					return response(
 						StatusCode::BAD_REQUEST,
 						format!("invalid peer address: {}", e),
-					)
+					);
 				}
 				Ok(addr) => addr,
 			},

api/src/lib.rs

@@ -22,22 +22,14 @@ use grin_util as util;
 use failure;
 #[macro_use]
 extern crate failure_derive;
-use hyper;
 #[macro_use]
 extern crate lazy_static;
 
-use serde;
 #[macro_use]
 extern crate serde_derive;
-use serde_json;
 #[macro_use]
 extern crate log;
 
-use hyper_rustls;
-use rustls;
-
-use tokio_tcp;
-
 pub mod auth;
 pub mod client;
 mod handlers;