add simple Put/Get method with test

1) refactoring out getConnection() method
2) add Get/Put method and corresponding TestExample
3) using load pattern to close table
I don't understand.  Why would we need a single put for a single object.  That can be done with the existing HTableInterface API.

I thought we were going to all the bulkPut and BulkGet operations to be used from the SparkContext?