Simplify client generation

I don't have access to test it right now - if you can show that both constructors continue to work I'm ok merging this.

--
Steve - steveivy@gmail.com
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> On Sep 3, 2014, at 7:53 AM, cattail <notifications@github.com> wrote:
> 
> In lib/statsd.js:
> 
> > @@ -223,4 +223,5 @@ Client.prototype.close = function(){
> >      this.socket.close();
> >  }
> >  
> > +exports = module.exports = Client;
> >  exports.StatsD = Client;
> @sivy This line will compatible with old style constructor usage
> 
> —
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