Introduce release build handler

Utility script to handle builds from Jenkins to make things more
clear..
The script is able to manage offline installer, online installer
and repository build jobs.

A dedicated resource file is required for each build job which describes
all details needed.

Change-Id: I61b65124d3c0838a4ba12d2d49c1d47d017512f1
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>