Feature/jest2 (#322)

* Adding more tests
* adding jest
* fixing tests
* fixing linting
* removing 1 slash less
* fixing more tests
* fixing last test
* more last fixes

src/main.ts

@@ -1,4 +1,4 @@
-import path = require("path");
+import * as path from "path";
 
 export namespace DummyFiles {
   export function TestFolder(): string {