testing: add method to notify containers through a channel

[fsouza]

@gravis, can you take a look? :)

Related to issue #105.

[gravis]

LGTM.

I will test in real situation and let you know, but it looks very nice.
Thanks!

[fsouza]

Great! Can you test it using this branch? Then we can evolve the solution based on your real feedback, before merging. :)

[gravis]

Hi,

Looks good to me, but I still can't replace my fake docker server with this version. I still need to be able to orchestrate the containers behavior with something like you proposed:

Server.CustomHandler(path string, handler http.Handler)

I suggest to merge this PR, and start a new issue for this purpose, what do you think?

[fsouza]

Seems fair. Are you going to send the pull request for the handler customisation or should I do it? :)

[fsouza]

It's merged now!

[gravis]

Thanks!
If you have time, it would be nice otherwise I'll give a try next week.

[fsouza]

No problem! I will probably put something together before the end of this week.

Thanks for your feedback.