Rust 0.5.0

* ~900 changes, numerous bugfixes

* Syntax changes

* Removed <- move operator

* Completed the transition from the #fmt extension syntax to fmt!

* Removed old fixed length vector syntax - [T]/N

* New token-based quasi-quoters, quote_tokens!, quote_expr!, etc.

* Macros may now expand to items and statements

* a.b() is always parsed as a method call, never as a field projection

* Eq and IterBytes implementations can be automatically generated

with #[deriving_eq] and #[deriving_iter_bytes] respectively

* Removed the special crate language for .rc files

* Function arguments may consist of any irrefutable pattern

* Semantic changes

* & and ~ pointers may point to objects

* Tuple structs - struct Foo(Bar, Baz). Will replace newtype enums.

* Enum variants may be structs

* Destructors can be added to all nominal types with the Drop trait

* Structs and nullary enum variants may be constants

* Values that cannot be implicitly copied are now automatically moved

without writing move explicitly

&T may now be coerced to T

* Coercions happen in let statements as well as function calls

* use statements now take crate-relative paths

* The module and type namespaces have been merged so that static

method names can be resolved under the trait in which they are

declared

* Improved support for language features

* Trait inheritance works in many scenarios

* More support for explicit self arguments in methods - self, &self

@self, and ~self all generally work as expected

* Static methods work in more situations

* Experimental: Traits may declare default methods for the implementations

to use

* Libraries

* New condition handling system in core::condition

* Timsort added to std::sort

* New priority queue, std::priority_queue

* Pipes for serializable types, std::flatpipes'

* Serialization overhauled to be trait-based

* Expanded getopts definitions

* Moved futures to std

* More functions are pure now

* core::comm renamed to oldcomm. Still deprecated

* rustdoc and cargo are libraries now

* Misc

* Added a preliminary REPL, rusti`

* License changed from MIT to dual MIT/APL2