Make buffer implementation pluggable

[edescourtis]

NOTE: This is a work in progress intended only for review.

How does something like this look?

[ferd]

Yeah that sounds good to me. Plus we can probably test it easy by making a sample buffer that's just the queue module and ensuring it works like the existing queue option

[edescourtis]

Should we allow a buffer to receive options in the new function?

[ferd]

My initial reaction would be to say no because I'd believe things need to be simple, but I guess {mod, Mod, Args} could potentially work. It just means that the default buffers couldn't be implemented without a shim because they don't take arguments, so that's not a 100% match between semantics I guess.

[edescourtis]

Okay, I won't include it in this version but we can always add it later.

[edescourtis]

Take a look at this commit. Tell me if it's okay with you.

[ferd]

Cool, I'll try to take some time for this around the week-end. I've got a lot of OTP-21 prepardness to do first, but that should be on my list as well.

[edescourtis]

Let me know if you need help with anything.

[ferd]

Merged, re-versionned to 1.1.0, and published to hex + tagged. Thanks for the contribution!