Jest migration

Replaced mocha, chai, sinon and nyc with jest
Refactored tests to use jest
Removed gulp and associated dependencies
Replaced gulp with npm scripts (copyfiles, json, rimraf)
Updated all dependencies

Author: rmuchall

.editorconfig

@@ -0,0 +1,24 @@
+module.exports = {
+    modulePaths: ["<rootDir>/node_modules"],
+    transform: {
+        "^.+\\.tsx?$": "ts-jest"
+    },
+    testRegex: "(/__test__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
+    testEnvironment: "node",
+    moduleFileExtensions: [
+        "ts",
+        "tsx",
+        "js",
+        "jsx",
+        "json",
+        "node"
+    ],
+    modulePathIgnorePatterns: [
+        "<rootDir>/build/"
+    ],
+    coverageReporters: [
+        // "html",
+        // "lcov",
+        "text-summary"
+    ]
+};