Fixes issue #160

Create a fresh subject per request.

Also upgraded netty to 4.0.21.Final
Would be interesting to know why they removed it. We can bring our own along in the metrics module. 

Ben Christensen
310.782.5511  @benjchristensen

> On Jul 1, 2014, at 7:01 PM, Nitesh Kant <notifications@github.com> wrote:
> 
> In rx-netty/src/main/java/io/reactivex/netty/client/PoolStatsImpl.java:
> 
> > @@ -29,18 +30,18 @@
> >  @Deprecated
> >  public class PoolStatsImpl implements PoolStats, CompositeHttpClientBuilder.CloneablePoolStatsProvider {
> >  
> > -    private final LongAdder idleConnections;
> And yeah I had to remove this LongAdder instance because netty removed the internal class from their distribution.
> 
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