Add Client->timings() to send multiple values at once

[xosofox]

instead of using multiple timing() calls, use a key-value map for timings()

[marcqualie]

Thanks for contribution @xosofox!

[fedeisas]

@xosofox is there any reason why this doesn't allow for multiple timers with the same key. I'm trying to bulk my StatsD metrics (https://github.com/statsd/statsd/blob/master/docs/metric_types.md#multi-metric-packets) but sometimes I have many instances of the same timer. I ask because I'm not a StatsD expert and I might be missing something.

[xosofox]

@xosofox is there any reason why this doesn't allow for multiple timers

There is no 'real' reason besides the fact that I didn't see that use case (in my project).
So I just used a simple array with key=>value. The function could of course be extend to check if the values of the passed array are key=>value pairs again.

You might want to check the code and give it a shot in another Pull Request