BUG: Update launcher to version 0.1.14. Fixes #3771

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Author: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>
Date:   Tue Jul 22 18:19:04 2014 -0400

    Ensure 'additionalPathVariables' is not overridden. Fixes #56

    Commit 714981 generalized how environment variables dealing with paths
    were managed. This commit fixes a regression where environment variables
    set in the main settings file where not considered is additional settings
    where found.
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git-svn-id: http://svn.slicer.org/Slicer4/trunk@23475 3bd1e089-480b-0410-8dfb-8563597acbee