Add zhash value type about kiwi

[vrongmeal]

When inserting, you can do both the things. Parameters are dynamic. So if you get one parameter you can just insert it, if you get two, you can insert while setting the value. There will always be a "SET" action if someone wants to insert the key and then set the value.

[carmo-evan]

PR is up here #17

[carmo-evan]

I'd like to take a stab at this, if that's ok.

[vrongmeal]

I'd like to take a stab at this, if that's ok.

@carmo-evan Go ahead. That would be awesome!

[carmo-evan]

@vrongmeal Hi! Sorry, I just had a chance to look into it yesterday.

From what I can gather, zhash will be very similar to zset, and we can probably use the same underlying sortedSet value.

What would you like the API to be like? Do you want to be able to insert the value together with they key in the INSERT method, or do you want to do it in two steps - insert the key, and then update to set the value and the score?

Thank you!

[vrongmeal]

Closed through #17