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/coffee/controllers/markdown_section_controller.coffee

@@ -51,13 +51,10 @@ module.exports = class MarkdownSectionController extends BaseController
         refs = tree[1].references
 
         findLinkRefs = (node)=>
-            logger.debug "inspecting a #{node[0]}"
             if node[0] is 'link_ref'
                 name = node[2]
-                logger.debug "found a link_ref for #{name}"
                 item = @modPack.findItemByName node[2]
                 if item?
-                    logger.debug "found related item: #{item}"
                     node[0] = 'link'
                     node[1].href = Url.item itemSlug:item.slug.item, modSlug:item.slug.mod
                     delete node[1].ref