queryType: select

Since we plan to use it, I went away and implemented first piece for #11 myself :-).
I like that idea!

> On Sep 5, 2014, at 6:39 PM, Karol Woźniak <notifications@github.com> wrote:
> 
> In pydruid/client.py:
> 
> > +        :param list dimensions: The list of dimensions to select. If left empty, all dimensions are returned
> > +        :param list metrics: The list of metrics to select. If left empty, all metrics are returned
> > +
> > +        :return: The query result
> > +        :rtype: list[dict]
> > +
> > +        Example:
> > +
> > +        .. code-block:: python
> > +            :linenos:
> > +
> > +                >>> raw_data = query.select(
> > +                        datasource=twitterstream,
> > +                        granularity='all',
> > +                        intervals='2013-06-14/pt1h',
> > +                        pagingSpec={'pagingIdentifies': {}, 'threshold': 1}
> I guess I could make it an object (in similar way to Dimension). What do you think?
> 
> —
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