ctxhttp package

[pjebs]

Since Go1.7, no-one talks about the x/net/context package anymore.
Everyone only talks about the Context package that is now part of the standard library.

When (if ever) will x/net/context/ctxhttp be part of the standard library.
It is a handy package that few discuss online. It should be part of standard library.

[bradfitz]

The net/http package supports contexts as of Go 1.7:

https://golang.org/doc/go1.7#context
https://golang.org/doc/go1.7#net_http

That replaces the need for ctxhttp.