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
```

tests/unit/global_vars/root_path_spec.js

@@ -0,0 +1,25 @@
+var fs = require("fs");
+var path = require("path");
+var chai = require("chai");
+var expect = chai.expect;
+
+describe("'global.root_path' set in js/app.js", function() {
+	var appMM =  require("../../../js/app.js")
+
+	var expectedSubPaths = [
+		"modules",
+		"serveronly",
+		"js",
+		"js/app.js",
+		"js/main.js",
+		"js/electron.js",
+		"config"
+	];
+
+	expectedSubPaths.forEach(subpath => {
+		it(`contains a file/folder "${subpath}"`, function() {
+			expect(fs.existsSync(path.join(global.root_path, subpath))).to.equal(true);
+		});
+	});
+});
+