QtIFW

Implement basic dependees function. Update commment.

Change-Id: I81aa563be02a68fa4f7eca8b39bae35e2c9c7377
Reviewed-on: http://codereview.qt.nokia.com/3100
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>