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
remove committed window id when doing test
Merge pull request #724 from davidyan-malhar/MLHR-786-pull

MLHR-786 #resolve