Fix configuration:

 * We don't really need scripts for running both mocha and nodemod. It's useful
   for development purposes, but it is a bit messy in a config.
 * I noticed that leaving configuration in `mocha.opts` made the whole testing
   framework not working both on OS X and Windows. I moved the config back to
   the command line (and bail works from command line)

Basically removing bash-specific stuff solved the issue.

Author: voter101

package.json

@@ -6,10 +6,8 @@
   "scripts": {
     "compile": "babel exercises --out-dir src",
     "setup": "npm install && ncp koans/ exercises/",
-    "nodemon": "nodemon",
-    "start": "npm run compile && npm run nodemon server.js",
-    "mocha": "mocha",
-    "test": "npm run compile && npm run mocha",
+    "start": "npm run compile && nodemon server.js",
+    "test": "npm run compile && mocha -b --compilers js:babel/register --require test/helpers.js test/**/*.js",
     "watch": "onchange exercises/*.jsx -- npm run test"
   },
   "repository": {