Refactoring tests and moving code to common module

1. All tests have been converted into regular command-line mocha
   tests (instead of running in the browser), and the deployment
   script has been changed to automatically fail any `--new`
   deployment which doesn't pass.
2. Several small class (e.g., `Logger`) have been moved into a common
   module, `crafting-guide-common` so that they may be shared between
   the client and server.

src/jade/includes/_footer.jade

@@ -32,5 +32,5 @@
         .action
             iframe(src="http://ghbtns.com/github-btn.html?user=andrewminer&repo=crafting-guide&type=fork&size=large",
               allowtransparency="true", frameborder="0", scrolling="0", width="100", height="32")
-    a(href="/test.html", rel="nofollow")
-        .divider.bottom
+
+    .divider.bottom

src/jade/test.jade

@@ -1,35 +0,0 @@
-//-
-//- Crafting Guide - test.jade
-//-
-//- Copyright (c) 2014-2015 by Redwood Labs
-//- All rights reserved.
-//-
-
-doctype html
-html
-    head
-        title Crafting Guide Unit Tests
-        meta(charset="UTF-8")
-        link(href="/images/favicon.png", rel="icon", type="image/png")
-
-        block styles
-            link(rel="stylesheet", type="text/css", href="/css/main.css")
-            link(rel="stylesheet", type="text/css", href="css/mocha.css")
-            style #mocha-stats { position: absolute; top: 12em; }
-
-    body
-        block body
-            .view__feedback
-            .view__screen
-
-            .content
-                include ./includes/_header.jade
-                .page
-                    #mocha
-                include ./includes/_footer.jade
-
-            block scripts
-                include ./includes/_standard_scripts.jade
-                script(src="/js/mocha.js")
-                script(src="/js/chai.js")
-                script(src="/js/test.js")