Squashed commit of the following:

commit 4e3663a6b4e8186b57d922bd7eceabbbf81372c4
Author: RashmiDR <rashmi@datatorrent.com>
Date:   Fri Feb 21 19:49:52 2014 -0800

    HDFSWordInputOperator thats reads specified words of specified size from file on HDFS, fixes#SPOI-1403