Update package.json to properly specify deps

Update the `package.json` file to properly specify the dependency on
`crafting-guide-common` by referring to it's GitHub repository. This
should allow someone working on this package to have NPM donwload it
like anything else (including CircleCI).

Also change the `link-deps` Grunt command to `use-local-deps` and
make it remove the NPM-downloaded version and replace it with a
symlink to a local copy.

package.json

@@ -39,13 +39,10 @@
   },
   "dependencies": {
     "backbone": "^1.1.2",
-    "chai": "^1.10.0",
+    "crafting-guide-common": "git://github.com/andrewminer/crafting-guide-common",
     "jade": "^1.8.2",
     "jquery": "^2.1.3",
     "markdown": "^0.5.0",
-    "mocha": "^2.0.1",
-    "sinon": "^1.12.2",
-    "sinon-chai": "^2.6.0",
     "underscore": "^1.7.0",
     "when": "^3.6.4"
   }