Set unstable feature names appropriately

* `core` - for the core crate
* `hash` - hashing
* `io` - io
* `path` - path
* `alloc` - alloc crate
* `rand` - rand crate
* `collections` - collections crate
* `std_misc` - other parts of std
* `test` - test crate
* `rustc_private` - everything else

src/libcoretest/lib.rs

@@ -11,7 +11,6 @@
 #![feature(unsafe_destructor, slicing_syntax)]
 #![feature(unboxed_closures)]
 #![feature(box_syntax)]
-#![feature(unnamed_feature)]
 #![allow(unknown_features)] #![feature(int_uint)]
 
 extern crate core;