replace x/net/context with context package #212
Description
Thanks for this great library, I really like to use it!
At some point this library should use the context standard library package instead of the old golang.org/x/net/context one. The new package was introduced in Go 1.7, and is now available for almost a year already.
This is a little problem for me since I use the standard context package in my code, and the old x/net package then causes import conflicts, which requires me to change the import to something like netcontext so that I can use both at the same time.
If you decide that this is something we should do, then I could send a PR that changes this.