add About page (jeneric) with system stats

Squashed commit of the following:

commit f53b3778de8dc529c0d161a9339ad14e21294802
Author: Eric A. Miller <emiller@cpan.org>
Date:   Sun Sep 8 21:05:39 2013 -0400

    remove header from statistics table

commit fa69b1b5900444ca5320502d8c22ecd7ee21df45
Author: Eric A. Miller <emiller@cpan.org>
Date:   Sun Sep 8 21:00:02 2013 -0400

    about page - software and statistics

Netdisco/lib/App/Netdisco/Web.pm

@@ -19,6 +19,7 @@ use App::Netdisco::Web::Report;
 use App::Netdisco::Web::AdminTask;
 use App::Netdisco::Web::TypeAhead;
 use App::Netdisco::Web::PortControl;
+use App::Netdisco::Web::About;
 
 sub _load_web_plugins {
   my $plugin_list = shift;