Major Description
The python converter `HBaseResultToStringConverter` provided in the HBaseConverter.scala returns only the value of first column in the result. It limits the utility of this converter, because it returns only one value per row(perhaps there are several version in hbase) and moreover it loses the other information of record, such as column:cell, timestamp.
Here we would like to propose an improvement about python converter which returns all the records in the results (in a single string) with more complete information. We would like also make some improvements for hbase_inputformat.py
