auto merge of #15591 : aturon/rust/box-cell-stability, r=alexcrichton

This PR is the outcome of the library stabilization meeting for the
`liballoc::owned` and `libcore::cell` modules.

Aside from the stability attributes, there are a few breaking changes:

* The `owned` modules is now named `boxed`, to better represent its
  contents. (`box` was unavailable, since it's a keyword.) This will
  help avoid the misconception that `Box` plays a special role wrt
  ownership.

* The `AnyOwnExt` extension trait is renamed to `BoxAny`, and its `move`
  method is renamed to `downcast`, in both cases to improve clarity.

* The recently-added `AnySendOwnExt` extension trait is removed; it was
  not being used and is unnecessary.

[breaking-change]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/io/timer.rs b/src/libstd/io/timer.rs
index 432461c4606..1c9e428dcad 100644
--- a/src/libstd/io/timer.rs
+++ b/src/libstd/io/timer.rs
@@ -20,7 +20,7 @@ and create receivers which will receive notifications after a period of time.
 use comm::{Receiver, Sender, channel};
 use io::{IoResult, IoError};
 use kinds::Send;
-use owned::Box;
+use boxed::Box;
 use rt::rtio::{IoFactory, LocalIo, RtioTimer, Callback};
 
 /// A synchronous timer object