Babel 7 and TypeScript support (not-an-aardvark#200)

* Added TS entrypoint in `package.json`
* Added JS script for copying over d.ts files
* Added npm script for type-checking TS files
* Added npm script for generating .d.ts files from .ts files
* Added TS-ESLint plugin and parser
* Added TS definition files from DefinitelyTyped

* Updated to Babel 7 - including plugins
* Updated compile script to type-check, compile, and copy d.ts files
* Updated ESLint to work with TS

.babelrc

@@ -1,14 +1,15 @@
 {
+  "ignore": ["**/*.d.ts"],
   "plugins": [
-    "lodash",
-    "transform-async-to-generator",
-    "transform-es2015-arrow-functions",
-    "transform-es2015-block-scoping",
-    "transform-es2015-destructuring",
-    "transform-es2015-modules-commonjs",
-    "transform-es2015-parameters",
-    "transform-es2015-spread",
-    "transform-es2015-template-literals",
-    "transform-object-rest-spread"
+    "@babel/plugin-transform-typescript",
+    "@babel/plugin-transform-async-to-generator",
+    "@babel/plugin-transform-arrow-functions",
+    "@babel/plugin-transform-block-scoping",
+    "@babel/plugin-transform-destructuring",
+    "@babel/plugin-transform-modules-commonjs",
+    "@babel/plugin-transform-parameters",
+    "@babel/plugin-transform-spread",
+    "@babel/plugin-transform-template-literals",
+    "@babel/plugin-proposal-object-rest-spread"
   ]
 }

.eslintrc.yml

@@ -108,9 +108,12 @@ extends:
 plugins:
   - import
   - promise
+  - '@typescript-eslint'
 
 root: true
 
+parser: "@typescript-eslint/parser"
+
 parserOptions:
   ecmaVersion: 2017
   sourceType: module