Commits on Jan 13, 2017

1. Making it possible to push metrics in chunks rather than one at a time …

   When using `dogstatde` to push a _lot_ of custom Datadog metrics, we've
   observed that the overhead of checking workers out & back in of the
   `dogstatsd_worker` `wpool` can become a performance bottleneck.
   
   This patch makes it possible to submit several metrics of the same type
   at one time, hence allowing for a single worker check-out/in cycle to submit
   them all, for example:
   ```
   dogstatsd:gauge([{"users", UserTypeCount, #{ user_type => UserType }}
                    || {UserTypeCount, UserType} <- UserCounts]).
   ```
   
   We've deployed that in production, and found a noticeable difference in our
   use case.
   
   This patch should be entirely backward-compatible.
   
   Updated tests, and added a few more.

   

   wk8 committed Jan 13, 2017
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