Minor clean up for test suite

@roramirez thanks for starting adding tests. I figured that we might as well grunt them and follow same rules for linting as we do for rest of JS code in the repo.

I've made following minor modifications:
- added tests to the grunt target
- fixed indentation in package.json
- made tests a bit more descriptive
- fixed eslint errors surfaced by grunt

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "start": "electron js/electron.js",
     "postinstall": "sh installers/postinstall/postinstall.sh",
-	"test": "./node_modules/mocha/bin/mocha tests --recursive"
+    "test": "./node_modules/mocha/bin/mocha tests --recursive"
   },
   "repository": {
     "type": "git",