Converted to TypeScript (#35)

* Remove babel & webpack. Converted code to TypeScript.
* Safer null checking all around
* 100% code coverage w/ re-organized tests
* Removed dependency on LoDash

Author: ChrisMBarr

.babelrc

@@ -0,0 +1,52 @@
+{
+  "root": true,
+  "overrides": [
+    {
+      "files": ["src/**/*.ts"],
+      "parserOptions": {
+        "project": ["tsconfig.json"]
+      },
+      "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/strict"
+      ],
+      "rules": {
+        "@typescript-eslint/explicit-function-return-type": "warn",
+        "@typescript-eslint/method-signature-style": ["warn"],
+        "@typescript-eslint/no-extraneous-class": "off",
+        "no-invalid-this": "off",
+        "@typescript-eslint/no-invalid-this": "error",
+        "no-loop-func": "off",
+        "@typescript-eslint/no-loop-func": "error",
+        "no-redeclare": "off",
+        "@typescript-eslint/no-redeclare": "error",
+        "no-shadow": "off",
+        "@typescript-eslint/no-shadow": "error",
+        "no-use-before-define": "off",
+        "@typescript-eslint/no-use-before-define": "error",
+        "@typescript-eslint/no-unnecessary-qualifier": "warn",
+        "@typescript-eslint/prefer-readonly": "warn",
+        "@typescript-eslint/prefer-regexp-exec": "error",
+        "no-return-await": "off",
+        "@typescript-eslint/return-await": "error",
+        "@typescript-eslint/strict-boolean-expressions": "error",
+
+        "array-callback-return": "error",
+        "complexity": ["error", { "max": 8 }],
+        "eqeqeq": ["error", "always", { "null": "ignore" }],
+        "no-unused-vars": "warn",
+        "object-shorthand": ["warn", "always"]
+      }
+    },
+    {
+      "files": ["src/**/*.test.ts"],
+      "parserOptions": {
+        "project": ["tsconfig.test.json"]
+      },
+      "rules": {
+        "@typescript-eslint/no-non-null-assertion": ["off"],
+        "@typescript-eslint/explicit-function-return-type": "off"
+      }
+    }
+  ]
+}

.eslintrc.js

@@ -2,3 +2,4 @@
 node_modules
 dist
 coverage
+test

.eslintrc.json

@@ -35,7 +35,7 @@ You can parse the contents of the file to create a `Song` object:
 
 ```javascript
 const fs = require('fs');
-const SongPro = require('SongPro');
+const { SongPro } = require('songpro');
 
 fs.readFile('escape-capsule.md', function(err, contents) {
     let song = SongPro.parse(contents);
@@ -48,7 +48,7 @@ fs.readFile('escape-capsule.md', function(err, contents) {
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/SongProOrg/songpro-js.
+Bug reports and pull requests are welcome on GitHub at https://github.com/SongProOrg/songpro-javascript
 
 ## License