Producer generates incorrect timezone (double shift)

[Spudz76]

A: https://github.com/squeeks/glossy/blob/master/lib/glossy/produce.js#L358
This loop adjusts the time string based on the incoming Date object timezone... to make the time UTC

B: https://github.com/squeeks/glossy/blob/master/lib/glossy/produce.js#L363
Then this logic translates the original Date object timezone to append to the already adjusted time string.

So, this needs to either A or B but not both. Probably should just roll on through with timeOffset as 'Z'... Everyone loves UTC on the wire and it already does a nice job pre-shifting.

[Spudz76]

Fixed in PR #17