signal: undo nested example cargo project

.. after learning about `cargo run --example`

examples/ctrl-c.rs

@@ -0,0 +1,34 @@
+extern crate futures;
+extern crate tokio_core;
+extern crate tokio_signal;
+
+use futures::stream::Stream;
+use tokio_core::reactor::Core;
+
+fn main() {
+    // set up a Tokio event loop
+    let mut core = Core::new().unwrap();
+
+    // tokio_signal provides a convenience builder for Ctrl+C
+    // this even works cross-platform, linux and windows!
+    let ctrlc = tokio_signal::ctrl_c(&core.handle());
+    let stream = core.run(ctrlc).unwrap();
+
+    println!("This program is now waiting for you to press Ctrl+C");
+
+    // for_each is a powerful primitive provided by the Futures crate
+    // it turns a Stream into a Future that completes after all stream-items
+    // have been completed.
+    let future = stream.for_each(|()| {
+        println!("Ctrl+C received!");
+        Ok(())
+    });
+
+    // Up until now, we haven't really DONE anything, just prepared
+    // now it's time to actually schedule, and thus execute, the stream
+    // on our event loop
+    core.run(future).unwrap();
+
+    println!("this won't be printed, because the received Ctrl+C will also kill the program");
+    unreachable!();
+}