Add possibility to set timeout

[seregayoga]

It would be great to have a possibility to set a timeout to avoid workaround like this https://github.com/robertkrimen/otto#halting-problem

[deoxxa]

I'm confused - you linked to the readme where it says exactly how to do what you want. I'm not sure what action you want someone to take.

[seregayoga]

As user of library I want to run vm without knowing about Interrupt channel. I just want to set timeout. So I offer solution for this issue in #277

[dotzero]

I have nothing against the solution that you provide in Readme, but I'm sure it's a bad idea to have it in our codebase.

It would be nice if it was a part of the library. So if there is a more elegant solution in the future, everyone who use it will have an updated version of solution.

[stevenh]

Is it something like the following which people are looking for:

vm.RunContext(ctx, `code here`)

[seregayoga]

@stevenh nowadays I think this is a preferred API, yes.