Fix a dead URL
Update link_name=... -> link(name=...
Don't include rpath lines in dependency lists

The rpath variable should only be used when executing commands, if it leaks into
a dependency list is causes havoc with the dependencies.
Add some doc examples to lib{green,native}

"How do I start in libX" is a common question that I've seen, so I figured
putting the examples in as many places as possible is probably a good idea.
auto merge of #12076 : alexcrichton/rust/rpath-makefile-dep, r=thestinger

The rpath variable should only be used when executing commands, if it leaks into
a dependency list is causes havoc with the dependencies.
auto merge of #12077 : colemickens/rust/patch-1, r=alexcrichton
Make semver::Version fields public
auto merge of #12078 : colemickens/rust/patch-2, r=alexcrichton
moved collections from libextra into libcollections
Implement std::fmt::Show for semver::{Identifier, Version}
Add new function str::from_utf8_lossy()

from_utf8_lossy() takes a byte vector and produces a ~str, converting
any invalid UTF-8 sequence into the U+FFFD REPLACEMENT CHARACTER.

The replacement follows the guidelines in §5.22 Best Practice for U+FFFD
Substitution from the Unicode Standard (Version 6.2)[1], which also
matches the WHATWG rules for utf-8 decoding[2].

[1]: http://www.unicode.org/versions/Unicode6.2.0/ch05.pdf
[2]: http://encoding.spec.whatwg.org/#utf-8
Hoist path::Display on top of from_utf8_lossy()
auto merge of #12010 : HeroesGrave/rust/libcollection, r=alexcrichton

Part of #8784

Changes:
- Everything labeled under collections in libextra has been moved into a new crate 'libcollection'.
- Renamed container.rs to deque.rs, since it was no longer 'container traits for extra', just a deque trait.
- Crates that depend on the collections have been updated and dependencies sorted.
- I think I changed all the imports in the tests to make sure it works. I'm not entirely sure, as near the end of the tests there was yet another `use` that I forgot to change, and when I went to try again, it started rebuilding everything, which I don't currently have time for. 

There will probably be incompatibility between this and the other pull requests that are splitting up libextra. I'm happy to rebase once those have been merged.

The tests I didn't get to run should pass. But I can redo them another time if they don't.
auto merge of #12062 : kballard/rust/from_utf8_lossy, r=huonw

`from_utf8_lossy()` takes a byte vector and produces a `~str`, converting
any invalid UTF-8 sequence into the U+FFFD REPLACEMENT CHARACTER.

The replacement follows the guidelines in §5.22 Best Practice for U+FFFD
Substitution from the Unicode Standard (Version 6.2)[1], which also
matches the WHATWG rules for utf-8 decoding[2].

[1]: http://www.unicode.org/versions/Unicode6.2.0/ch05.pdf
[2]: http://encoding.spec.whatwg.org/#utf-8

Closes #9516.
auto merge of #12083 : bjz/rust/semver, r=huonw
Span debugger
Correct span for ExprFnBlock, ExprMethodCall, ExprParen
Add comments to span debugger
auto merge of #12087 : sanxiyn/rust/show-span, r=huonw
Add unimplemented! macro