Clean up unused code and long imports. (#137)

This removes some commented out methods, and also changes instances of
::std::foo to use a more idiomatic import path.

src/stream.rs

@@ -1,3 +1,4 @@
+use std::fmt;
 use std::io::{
     BufRead, BufReader, Cursor, Error as IoError, ErrorKind, Read, Result as IoResult, Write,
 };
@@ -102,8 +103,8 @@ pub(crate) fn io_err_timeout(error: String) -> IoError {
     IoError::new(ErrorKind::TimedOut, error)
 }
 
-impl ::std::fmt::Debug for Stream {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::result::Result<(), ::std::fmt::Error> {
+impl fmt::Debug for Stream {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(
             f,
             "Stream[{}]",