Add vec.rs each2_mut function
Add vec.rs each2_mut testsuite
Add inverse hyperbolic functions
core: Move unstable to unstable/mod.rs
core: Move locks, atomic rc to unstable::sync
core: Rename SharedMutableState to UnsafeAtomicRcBox
auto merge of #6387 : brson/rust/unstable, r=brson

r? @pcwalton

* Move `SharedMutableState`, `LittleLock`, and `Exclusive` from `core::unstable` to `core::unstable::sync`
* Modernize the `SharedMutableState` interface with methods
* Rename `SharedMutableState` to `UnsafeAtomicRcBox` to match `RcBox`.
Remove re-exports from libcore/core.rc

Also fix up all the fallout elsewhere throughout core. It's really nice being
able to have the prelude.
revert PriorityQueue to using init()

uninit() would result in potentially running a destructor on arbitrary
memory if the Ord implementation throws
auto merge of #6388 : recrack/rust/each2_mut, r=pcwalton

- vec.rs :add 'each2_mut function'
- testsuit : run-pass/vec-each2_mut.rs
Add ldexp and frexp functions
Remove unnecessary infinity check
Upgrade libuv
auto merge of #6456 : brson/rust/libuv, r=brson

This includes 26fa6f8 which fixes #6258

@ILyoan I ported your patches forward and confirmed that they build but you should be aware of this upgrade.
auto merge of #6461 : thestinger/rust/fix_priority_queue, r=pcwalton

uninit() would result in potentially running a destructor on arbitrary
memory if the Ord implementation throws
auto merge of #6441 : alexcrichton/rust/issue-5531, r=luqmana

Also fix up all the fallout elsewhere throughout core. It's really nice being
able to have the prelude.

I'm not quite sure how resolution works with traits, but it seems to me like the public imports at the top-level of the core crate were leaking into the sub-crates, but that could also be working as intended. Regardless, things compile without the re-exports now.
auto merge of #6463 : bjz/rust/numeric-traits, r=thestinger

This is part of the numeric trait reform tracked on issue #4819
Move `position` and `rposition` methods to `ImmutableVector` trait
Use static string with fail!() and remove fail!(fmt!())

fail!() used to require owned strings but can handle static strings
now. Also, it can pass its arguments to fmt!() on its own, no need for
the caller to call fmt!() itself.
Fix cosmetics for fail!() calls