First pass at:  https://issues.jboss.org/browse/DTGOV-13

The overlord commons stuff now has a dedicated installer that can be
invoked from other installers (e.g. dtgov, rtgov).
Merge pull request #4 from EricWittmann/dtgov-13-installer

First pass at:  https://issues.jboss.org/browse/DTGOV-13