Fixed issue 1155.

R=golang-dev, adg, rsc
CC=golang-dev
https://golang.org/cl/4592059

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4628050

goinstall: make ".git" repo suffix optional

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/4643048

R=paulzhol, mirtchovski, fshahriar, alex.brainman, r
CC=golang-dev
https://golang.org/cl/4386041

Extend goinstall to support downloading from any hg/git/svn/bzr hosting
site, not just the standard ones.  The type of hosting is automatically
checked by trying all the tools, so the import statement looks like:

  import "example.com/mything"

Which will work for Mercurial (http), Subversion (http, svn), Git (http,
git) and Bazaar (http, bzr) hosting.

All the existing package imports will work through this new mechanism,
but the existing hard-coded host support is left in place to ensure
there is no change in behaviour.

R=golang-dev, bradfitz, fvbommel, go.peter.90, n13m3y3r, adg, duperray.olivier
CC=golang-dev
https://golang.org/cl/4650043

No difference in content or appearance.
Forgot to do this when I updated this file a few days ago.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4626056

currently only defined for darwin

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4528123

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4631053

R=paulzhol, mirtchovski, r, r, rsc
CC=golang-dev
https://golang.org/cl/4362041

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4628048

It's sad to think there are environments where compiling against a library
isn't enough information for the the linker to decide that you need that
library.
TBR=jdpoirier

R=jdpoirier
CC=golang-dev
https://golang.org/cl/4646047

TBR=jdpoirier

R=jdpoirier
CC=golang-dev
https://golang.org/cl/4648045

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/4648043

remove explicit linking in make files

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4629051

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/4638046

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4627047

(Variable is referred to alternately as 'r' and 'req')

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4648042

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4639046

R=ken2
CC=golang-dev
https://golang.org/cl/4635051

R=ken2
CC=golang-dev
https://golang.org/cl/4640045

R=ken2
CC=golang-dev
https://golang.org/cl/4627045

Remove now-unnecessary zeroing of stack frames.

R=ken2
CC=golang-dev
https://golang.org/cl/4641044

R=ken2
CC=golang-dev
https://golang.org/cl/4646042

R=gri, r, r
CC=golang-dev
https://golang.org/cl/4631045

R=gri
CC=golang-dev
https://golang.org/cl/4625044

R=adg
CC=golang-dev
https://golang.org/cl/4643045

R=lucio.dere, vcc.163, bradfitz
CC=golang-dev
https://golang.org/cl/4645044

R=dsymonds
CC=golang-dev
https://golang.org/cl/4648041

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4643044

Fixes #1962.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4636044

package name.

R=r, rsc
CC=golang-dev
https://golang.org/cl/4630042

R=r, r
CC=golang-dev
https://golang.org/cl/4630041

R=golang-dev, mattn.jp, adg
CC=golang-dev
https://golang.org/cl/4634043

Fixes #1961

R=golang-dev, rsc, r
CC=golang-dev
https://golang.org/cl/4633045

R=r, r
CC=golang-dev
https://golang.org/cl/4571074

Previously Request and Response had redundant fields for
Referer, UserAgent, and cookies which caused confusion and
bugs.  It also didn't allow us to expand the package over
time, since the way to access fields would be in the Headers
one day and promoted to a field the next day.  That would be
hard to gofix, especially with code ranging over Headers.

After a discussion on the mail package's design with a similar
problem, we've designed to make the Headers be the source of
truth and add accessors instead.

Request:
change: Referer -> Referer()
change: UserAgent -> UserAgent()
change: Cookie -> Cookies()
new: Cookie(name) *Cookie
new: AddCookie(*Cookie)

Response:
change: Cookie -> Cookies()

Cookie:
new: String() string

R=rsc
CC=golang-dev
https://golang.org/cl/4620049

Attributes without value are commen in html and the xml
parser will accept them in non-strict mode and use the
attribute name as value. Thus parsing <p nowrap> as
<p norwar="nowrap">.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4601053

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4589055

It was always a weird interface but I didn't know what I
was doing at the time.  rsc questioned me about it then
but didn't press on it during review.  Then adg bugged me
about it too recently.

So clean it up. It parallels the Writer struct too.

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/4602063

Correct a few error messages (libcgo -> runtime/cgo)
and delete old nacl_386.c file too.

Fixes #1657.

R=iant
CC=golang-dev
https://golang.org/cl/4603057