Add .gitreview config

Change-Id: I8cc491cdde3b0e949b77583a02a222b55c8c4ca6
Reviewed-on: http://gerrit.dmdirc.com/4018
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: util (new commits)

util:
    18985ed Chris Smith <chris@dmdirc.com>
            Add .gitreview config.

            Gerrit: http://gerrit.dmdirc.com/4020

Change-Id: I0693eed359c062f46eb5ee5234161ad9f6f29141