Squashed commit of the following:

commit 0afe7e033308a9844ee4985982339d5a0480ae9b
Author: David Yan <david@datatorrent.com>
Date:   Tue Jan 21 18:43:35 2014 -0800

    corrected comment

commit 18a062c2c185fab13f4d75ce1e629a54cb8f12f6
Author: David Yan <david@datatorrent.com>
Date:   Tue Jan 21 18:36:47 2014 -0800

    added AbstractStoreInputOperator
added setters for username and password in jdbc operator base
Merge pull request #644 from chandnisingh/JdbcStore

added setters for username and password in jdbc operator base
Merge pull request #642 from davidyan-malhar/dbInputAdaptor_pull

added AbstractStoreInputOperator
Merge branch 'master' of https://github.com/DataTorrent/Malhar
removed duplicates in pom