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

package.json

@@ -23,14 +23,13 @@
     "express": "^4.10.6",
     "grunt": "^0.4.5",
     "grunt-browserify": "^3.2.1",
-    "grunt-coffee": "0.0.6",
     "grunt-contrib-clean": "^0.6.0",
-    "grunt-contrib-coffee": "^0.13.0",
     "grunt-contrib-copy": "^0.7.0",
     "grunt-contrib-jade": "^0.13.0",
     "grunt-contrib-sass": "^0.8.1",
     "grunt-contrib-uglify": "^0.7.0",
     "grunt-contrib-watch": "^0.6.1",
+    "grunt-exorcise": "^1.0.1",
     "grunt-mocha-test": "^0.12.7",
     "grunt-rename": "^0.1.4",
     "grunt-rsync": "^0.6.2",