Implement HadoopPipeline.fromHadoopToTable.

Accept any hadoop input format, so long as it
maps from ImmutableBytesWritable to ImmutableBytesWritable.
That's not a tough restriction, as you can see in
the test. Other input formats can simply be
used using the proxy pattern.

Use the same decorator pattern to transfer the
configured object that is used in the table format.

Test had to be slightly altered, since SequenceFile
apparently means something more specific than I thought.
TextFile works fine, though.