Re-export actix dependency. Closes #260 (#264)

- Re-export actix's prelude into actix namespace
- Removing implicit dependency on root's actix module

src/ws/client.rs

@@ -1,4 +1,6 @@
 //! Http client request
+extern crate actix;
+
 use std::cell::UnsafeCell;
 use std::rc::Rc;
 use std::time::Duration;
@@ -14,7 +16,7 @@ use http::{Error as HttpError, HttpTryFrom, StatusCode};
 use rand;
 use sha1::Sha1;
 
-use actix::prelude::*;
+use self::actix::prelude::*;
 
 use body::Binary;
 use error::{Error, UrlParseError};