v2 Enable local development (#52)

- Create local dev environment
- Add gas-client and google-apps-script-webpack-dev-server packages for development
- Add dev/ wrapper app
- Update webpack config to support development environment
- Redesigned READMEs
- Support typescript
- Update npm scripts
- Organize and update .gitignore file
- Add .vscode settings for clasp files
- Remove tracking for files in dist/

tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "types": ["gas-types-detailed"],
+    "jsx": "react",
+    "esModuleInterop": true
+  }
+}