Make cookies an optional feature (default off)

src/lib.rs

@@ -156,6 +156,7 @@
 //!   `native-tls` library to connect over HTTPS.
 //! - **default-tls-vendored**: Enables the `vendored` feature of `native-tls`.
 //! - **rustls-tls**: Provides TLS support via the `rustls` library.
+//! - **cookies**: Provides cookie session support.
 //!
 //!
 //! [hyper]: http://hyper.rs
@@ -172,8 +173,6 @@
 ////! - **trust-dns**: Enables a trust-dns async resolver instead of default
 ////!   threadpool using `getaddrinfo`.
 
-extern crate cookie as cookie_crate;
-
 #[cfg(test)]
 #[macro_use]
 extern crate doc_comment;
@@ -208,6 +207,7 @@ mod error;
 mod async_impl;
 pub mod blocking;
 mod connect;
+#[cfg(feature = "cookies")]
 pub mod cookie;
 //#[cfg(feature = "trust-dns")]
 //mod dns;