Convert site to a single JavaScript archive

* Convert build to use a single JavaScript file on the site (instead
  of downloading each library separately). This also means that all
  global variables (e.g., `$` for JQuery, `_` for Underscore.js) can
  be removed.
* Remove unused scripts and/or move them to a more appropriate repo
* Update the `deploy` script to work with CircleCI's automation
* Update markdown display code to allow images to be located with the
  markdown data files instead of the pre-rendered index pages

test/parser_versions/mod_version_parser_v1.test.coffee

@@ -9,6 +9,7 @@ CommandParserVersionBase = require '../../src/coffee/models/parser_versions/comm
 ItemSlug                 = require '../../src/coffee/models/item_slug'
 ModVersion               = require '../../src/coffee/models/mod_version'
 ModVersionParserV1       = require '../../src/coffee/models/parser_versions/mod_version_parser_v1'
+_                        = require 'underscore'
 {Logger}                 = require 'crafting-guide-common'
 
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