refactor(error): remove redundant parts of error names

The old names followed the old style of including the module name and
"Error" in each variant. The new style is to refer to an error from its
owning module, and variants are now scoped to their enum, so there's no
need to include the enum name in the variant name.

BREAKING CHANGE: The terms `Http` and `Error` have been removed from the Error
  type and its variants. `HttpError` should now be accessed as `hyper::Error`,
  and variants like `HttpIoError` should be accessed as `Error::Io`.

src/client/request.rs

@@ -12,7 +12,6 @@ use net::{NetworkStream, NetworkConnector, HttpConnector, Fresh, Streaming};
 use http::{self, HttpWriter, LINE_ENDING};
 use http::HttpWriter::{ThroughWriter, ChunkedWriter, SizedWriter, EmptyWriter};
 use version;
-use HttpResult;
 use client::{Response, get_host_and_port};
 
 
@@ -43,14 +42,14 @@ impl<W> Request<W> {
 
 impl Request<Fresh> {
     /// Create a new client request.
-    pub fn new(method: method::Method, url: Url) -> HttpResult<Request<Fresh>> {
+    pub fn new(method: method::Method, url: Url) -> ::Result<Request<Fresh>> {
         let mut conn = HttpConnector(None);
         Request::with_connector(method, url, &mut conn)
     }
 
     /// Create a new client request with a specific underlying NetworkStream.
     pub fn with_connector<C, S>(method: method::Method, url: Url, connector: &mut C)
-        -> HttpResult<Request<Fresh>> where
+        -> ::Result<Request<Fresh>> where
         C: NetworkConnector<Stream=S>,
         S: Into<Box<NetworkStream + Send>> {
         let (host, port) = try!(get_host_and_port(&url));
@@ -76,7 +75,7 @@ impl Request<Fresh> {
 
     /// Consume a Fresh Request, writing the headers and method,
     /// returning a Streaming Request.
-    pub fn start(mut self) -> HttpResult<Request<Streaming>> {
+    pub fn start(mut self) -> ::Result<Request<Streaming>> {
         let mut uri = self.url.serialize_path().unwrap();
         //TODO: this needs a test
         if let Some(ref q) = self.url.query {
@@ -154,7 +153,7 @@ impl Request<Streaming> {
     /// Completes writing the request, and returns a response to read from.
     ///
     /// Consumes the Request.
-    pub fn send(self) -> HttpResult<Response> {
+    pub fn send(self) -> ::Result<Response> {
         let mut raw = try!(self.body.end()).into_inner().unwrap(); // end() already flushes
         if !http::should_keep_alive(self.version, &self.headers) {
             try!(raw.close(Shutdown::Write));