MLHR-786 #resolve

Squashed commit of the following:

commit 2704e25692d843c832500f11d5234815dac82043
Author: David Yan <david@datatorrent.com>
Date:   Mon Feb 17 14:34:56 2014 -0800

    MLHR-786 #resolve
    1. Added transaction unit test
    2. Separate operatorStore and testStore in unit test
    3. Fixed redis operator in transaction mode

commit a81ec5da1ba98850881896122a7967e4d67e7d3e
Author: David Yan <david@datatorrent.com>
Date:   Mon Feb 17 14:33:20 2014 -0800

    MLHR-786 #resolve
    1. Added transaction unit test
    2. Separate operatorStore and testStore in unit test
    3. Fixed redis operator in transaction mode