message: refactor(examples): remove log crate from server example
diff: -//#![deny(warnings)]
  +#![deny(warnings)]
  extern crate futures;
  extern crate hyper;
  extern crate pretty_env_logger;
  -#[macro_use]
  -extern crate log;
  use hyper::{Get, Post, StatusCode};
  use hyper::header::ContentLength;
  