Extract the reactor to a dedicated crate. (#169)

This allows libraries that require access to reactor related types to
depend on this crate without having to depend on the entirety of Tokio.

For example, libraries that implement their custom I/O resource will
need to access `Registration` or `PollEvented`.

tokio-threadpool/Cargo.toml

@@ -7,7 +7,7 @@ homepage = "https://github.com/tokio-rs/tokio"
 license = "MIT/Apache-2.0"
 authors = ["Carl Lerche <[email protected]>"]
 description = """
-A Future aware thread pool based on work stealing.
+A task scheduler backed by a work-stealing thread pool.
 """
 keywords = ["futures", "tokio"]
 categories = ["concurrency", "asynchronous"]

tokio-threadpool/README.md

@@ -45,8 +45,17 @@ pub fn main() {
 
 ## License
 
-`tokio-threadpool` is primarily distributed under the terms of both the MIT
-license and the Apache License (Version 2.0), with portions covered by various
-BSD-like licenses.
+This project is licensed under either of
 
-See LICENSE-APACHE, and LICENSE-MIT for details.
+ * Apache License, Version 2.0, ([LICENSE-APACHE](../LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](../LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Tokio by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.