[Issue 14] Switch Chef Zero control to Chef Zero gem.  Switch testing to Rspec.

Squashed commit of the following:

commit 32aa4c9f42670d996adff065072a3c50ae2087b1
Author: Andrew Gross <andrew@yipit.com>
Date:   Mon Aug 19 11:11:18 2013 -0400

    [Issue 14] Fixing up some of the test syntax and reconfiguring the make/rake files

commit 5e784b02995999575f78058dffff8ee15db1acb3
Author: Tom Duffield <tom@opscode.com>
Date:   Fri Aug 9 17:18:40 2013 -0500

    ChefZero Server is now controlled by gem rather than CLI

commit 0cc0b2c38ffda7002e154682c894f04d7351bfe6
Merge: c94a142 34fbf7f
Author: Tom Duffield <tom@opscode.com>
Date:   Thu Aug 8 08:18:34 2013 -0500

    Merge branch 'rspec' into issue14

commit 34fbf7f8c5f6c2c2ffd6ef4e7f6fbc4db2fc055f
Author: Tom Duffield <tom@opscode.com>
Date:   Thu Aug 8 08:16:43 2013 -0500

    switching from MiniTest to RSpec