Squashed commit of the following:

commit ef099e16e56d1de662777dfc8fd67c05510b385d
Merge: e12778c e49c560
Author: RashmiDR <rashmi@datatorrent.com>
Date:   Wed Mar 5 17:59:48 2014 -0800

    Merge branch 'master' of https://github.com/DataTorrent/Malhar into directoryScan2014

commit e12778cbe1f0365c63a0a7853a184ec5bae73cca
Author: RashmiDR <rashmi@datatorrent.com>
Date:   Wed Mar 5 17:46:19 2014 -0800

    fixing additional review findings for Directory Scan operator, fixes #MLHR-321