native$ no longer passes `release` function

[tswaters]

Using native$ is broken under seneca@3.4.0. release is no longer being passed to the callback.

Before, handle_result would be called apply with arguments: https://github.com/senecajs/seneca/blob/v3.3.0/seneca.js#L1029

By nature, the release function would come through.

Now, arguments is no longer passed and so this parameter gets lost:
https://github.com/senecajs/seneca/blob/v3.4.2/seneca.js#L904

native is pretty much broken without the ability to close the connection.

I'm not sure if there's a way within seneca to pass additional arguments to callback functions anymore. To mitigate this, it might be good to manage a pool internally within the store and emit a new client when native$ is invoked. Returning the client will allow end-users to call end on it.

This is, AFAIK, available on later versions of pg. This module, as it stands will need to make a few changes to work with pg@7 but I think it's probably a good call to perform the upgrade.

We've already forked this module internally to support schemas.... I'm going to do some work to upgrade to pg@latest and fix up this native issue. I'll see if I can't put together a PR for this repo.

[tswaters]

Actually, updating to pg@latest isn't really required; client.end is available on the currently pinned version.
I think we just need a docs update for using native$ in the readme, instead of "call release", say "call client.end"

[tswaters]

Actually, don't call client.end - this will result in timeouts on subsequent connections. I'm going to see if I can't put together PR to get this working, maybe by passing release through the meta parameter.

[tswaters]

Turns out meta is completely controlled by seneca, so you can't pass in arbitrary extra objects to it... I've fixed this by passing along the release function with the client. This works but still feels kind of dirty.... can't think of another way to solve it.