Restructured Test Suite

- separated tests into e2e and unit directories
- created configs directory structure to support test framework
- added/modified `npm run test`, `npm run test:unit` and `npm run test:e2e` to target all, unit and e2e tests respectively
- modified some of the test names to be more descriptive

New structure of the Test Suite has following directory tree:

```
tests
├── configs
│   ├── env.js
│   └── modules
│       ├── clock
│       │   ├── clock_12hr.js
│       │   ├── clock_24hr.js
│       │   └── clock_showPeriodUpper.js
│       └── helloworld
│           └── helloworld.js
├── e2e
│   ├── env_spec.js
│   └── modules
│       ├── clock_spec.js
│       └── helloworld_spec.js
└── unit
    ├── functions
    │   └── cmp_versions_spec.js
    └── global_vars
        └── root_path_spec.js
```

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "start": "sh run-start.sh",
     "postinstall": "sh installers/postinstall/postinstall.sh",
-    "test": "./node_modules/mocha/bin/mocha $(find tests -path '*js*' ! -ipath '*e2e*')",
+    "test": "./node_modules/mocha/bin/mocha tests/unit --recursive",
+    "test:unit": "./node_modules/mocha/bin/mocha tests/unit --recursive",
     "test:e2e": "./node_modules/mocha/bin/mocha tests/e2e --recursive"
   },
   "repository": {