docs: named lifetimes

* Include tip given by Leo Testard in mailing list about labeled `break`
and `continue`:
https://mail.mozilla.org/pipermail/rust-dev/2014-March/009145.html
* cross-reference named lifetimes in tutorial -> lifetimes guide
* Broke named lifetimes section into two sub-sections.
* Added mention of `'static` lifetime.
Added suggested notes

* Note on while loop not supporting named breaks.
* Note on hygienic macros (and example of such within loops)
green: Remove the dependence on the crate map

This is the final nail in the coffin for the crate map. The `start` function for
libgreen now has a new added parameter which is the event loop factory instead
of inferring it from the crate map. The two current valid values for this
parameter are `green::basic::event_loop` and `rustuv::event_loop`.
rustc: Remove all crate map support

The crate map is no longer necessary now that logging and event loop factories
have been moved out.

Closes #11617
Closes #11731
doc: Update the runtime guide with green changes

This updates a few code examples about booting libgreen/libnative and also
spells out how the event loop factory is required.
Prefer lifetime suggestion over generic error
Cleanup fixed issue #10734 workaround
Correct issue workaround references
std: expand the `Share` docs to make them more precise.

And give some examples about exactly what's `Share` and what's not.
auto merge of #13122 : sstewartgallus/rust/cleanup-10734-workarounds, r=alexcrichton

Cleanup old issue references. One of these workarounds no longer need to be used anymore and the others are out of date.
rustuv: Handle short writes in uv_fs_write

The libuv fs wrappers are very thin wrappers around the syscalls they correspond
to, and a notable worrisome case is the write syscall. This syscall is not
guaranteed to write the entire buffer provided, so we may have to continue
calling uv_fs_write if a short write occurs.

Closes #13130
std: Explicitly link to libm for freebsd

Apparently we had forgotten to do this for freebsd, causing possible problems
on FreeBSD 10. The discussion in #12324 has some more details about how it's
missing.
libstd: Document the following modules:

* native::io
* std::char
* std::fmt
* std::fmt::parse
* std::io
* std::io::extensions
* std::io::net::ip
* std::io::net::udp
* std::io::net::unix
* std::io::pipe
* std::num
* std::num::f32
* std::num::f64
* std::num::strconv
* std::os
std: Touch various I/O documentation blocks

These are mostly touchups from the previous commit.
auto merge of #13070 : huonw/rust/share-doc, r=alexcrichton

std: expand the `Share` docs to make them more precise.

And give some examples about exactly what's `Share` and what's not.
rustdoc: html: use raw strings for great justice
rustdoc: add some docs for item types
rustdoc: render derived impls separately
Changed `iter::Extendable` and `iter::FromIterator` to take a `Iterator` by value
auto merge of #12961 : cmr/rust/rustdoc-impls, r=alexcrichton

Rendered form available at http://docs.octayn.net/doc/

This moves derived impls to the bottom of the list, separate from the rest,
and collapses default methods that aren't overridden into an expandible
accordion.