Closes #97 - Create Range class for Fluo API

Pull request for #97
This will be done in #98

On Wed, Aug 6, 2014 at 10:39 AM, Keith Turner <notifications@github.com>
wrote:

> In modules/core/src/main/java/io/fluo/api/mapreduce/RowColumn.java:
>
> >  import io.fluo.api.Bytes;
> >  import io.fluo.api.Column;
> >
> > +/**
> > + * Represents a Row & Column in Fluo.
> > + * Similiar to an Accumulo Key.
> > + */
> >  public class RowColumn {
>
> should probably move this class to the same package as span
>
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> <https://github.com/fluo-io/fluo/pull/101/files#r15877637>.
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