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/

dev/.eslintrc.json

@@ -0,0 +1,44 @@
+{
+  "root": true,
+  "parser": "babel-eslint",
+  "extends": [
+    "airbnb-base",
+    "plugin:prettier/recommended",
+    "plugin:react/recommended"
+  ],
+  "plugins": ["babel", "react", "prettier"],
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "globals": {
+    "google": false,
+    "alert": false,
+    "css": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 9,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
+  "rules": {
+    "prettier/prettier": "error",
+    "react/prop-types": "warn",
+    "camelcase": "warn",
+    "import/prefer-default-export": "warn",
+    "import/no-extraneous-dependencies": "warn",
+    "prefer-object-spread": "warn"
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    },
+    "import/resolver": {
+      "node": {
+        "extensions": [".js", ".jsx"]
+      }
+    }
+  }
+}