Support for NumericLiteralSeparator, Stage 1 feature (#5793)

* Support for NumericLiteralSeparator, Stage 1 feature

commit cd8f6e062876261a334d968f875e477a48927b6d
Author: Sven SAULEAU <xtuc@users.noreply.github.com>
Date:   Wed May 31 16:14:15 2017 +0200

    docs: update README [skip ci]

commit cf013e3382bf73cdf9224026c1ec0b1a368cfef2
Author: Rick Waldron <waldron.rick@gmail.com>
Date:   Tue May 30 14:51:20 2017 -0400

    Support for NumericLiteralSeparator, Stage 1 feature

    Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

* add note about presets [skip ci]

packages/babel-plugin-syntax-numeric-separator/.npmignore

@@ -0,0 +1,3 @@
+node_modules
+*.log
+src

packages/babel-plugin-syntax-numeric-separator/README.md

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+# babel-plugin-syntax-numeric-separator
+
+> Allow parsing of Numeric Literals (Decimal, Binary, Hex and Octal) that contain a _NumericLiteralSeparator_.
+
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-syntax-numeric-separator
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["syntax-numeric-separator"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins syntax-numeric-separator script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["syntax-numeric-separator"]
+});
+```

packages/babel-plugin-syntax-numeric-separator/package.json

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+{
+  "name": "babel-plugin-syntax-numeric-separator",
+  "version": "7.0.0-alpha.12",
+  "description": "Allow parsing of Decimal, Binary, Hex and Octal literals that contain a Numeric Literal Separator",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-numeric-separator",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {},
+  "devDependencies": {}
+}

packages/babel-plugin-syntax-numeric-separator/src/index.js

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+export default function () {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("numericSeparator");
+    },
+  };
+}