Added Justinmind to In Kind Donators

@ashleymmeyers @mattboitan0 I asked for and received a bunch of donated licenses to http://www.justinmind.com/ for the Brigades. Is **In Kind** the right type of donor to list them as?

If so then feel free to accept this pull request. You can see it at http://jekit.codeforamerica.org/codeforamerica/codeforamerica.org/justinmind-inkind/supporters/