timer: Rename sleep to delay_for, reexport from tokio

tokio-timer/src/lib.rs

@@ -58,13 +58,15 @@ pub use timer::{set_default, Timer};
 
 use std::time::{Duration, Instant};
 
-/// Create a Future that completes at `deadline`.
+/// Create a Future that sleeps until `deadline`.
 pub fn delay(deadline: Instant) -> Delay {
     Delay::new(deadline)
 }
 
-/// Create a Future that completes in `duration` from now.
-pub fn sleep(duration: Duration) -> Delay {
+/// Create a Future that sleeps until `duration` from now.
+///
+/// Equivalent to `delay(Instant::now() + duration)`.
+pub fn delay_for(duration: Duration) -> Delay {
     delay(Instant::now() + duration)
 }
 

tokio/src/timer.rs

@@ -75,4 +75,6 @@
 //! [Interval]: struct.Interval.html
 //! [`DelayQueue`]: struct.DelayQueue.html
 
-pub use tokio_timer::{delay, delay_queue, timeout, Delay, DelayQueue, Error, Interval, Timeout};
+pub use tokio_timer::{
+    delay, delay_for, delay_queue, timeout, Delay, DelayQueue, Error, Interval, Timeout,
+};