Feature/page navigation (#93)

* Page navigation component

* Add page navigation component to project

* hoc to anchor, file name only

* asAnchor => Anchor component

* yarn lock

* as-nav-link fixtures and snapshot

* update usage instructions

* Separate React Router example from standard usage

* Remove `exact` from fixture links

* Snapshot update following `exact` change

* Change `let` for `const` in test

* Update non react router fixture to use non react router props

components/page-navigation/README.md

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+PageNavigation
+==============
+
+### Import
+```js
+  import PageNavigation from '@govuk-frederic/page-navigation';
+```
+<!-- STORY -->
+
+### Usage
+
+Default example
+
+```jsx
+import { Link } from 'react-router-dom';
+import PageNavigation, { asAnchor } from '@govuk-frederic/page-navigation';
+
+const NavLink = asAnchor(Link);
+const NavigationItems = [
+  {
+    url: '/',
+    title: 'Home',
+  },
+  {
+    url: '/section-01',
+    title: 'Section 01',
+  },
+  {
+    url: '/section-02',
+    title: 'Section 02',
+  },
+];
+
+…
+
+<PageNavigation>
+  {NavigationItems.map(({url, title}, index) => (
+    <NavLink key={index} to={url}>{title}</NavLink>
+  ))}
+</PageNavigation>
+```
+
+### TODO:
+- Add responsive considerations
+- Replace magic numbers from HOC items with constants
+
+### Properties
+Prop | Required | Default | Type | Description
+:--- | :------- | :------ | :--- | :----------
+ `children` |  | ```null``` | node | Navigation items
+
+

components/page-navigation/package.json

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+{
+  "name": "@govuk-frederic/page-navigation",
+  "version": "0.1.1",
+  "dependencies": {
+    "@govuk-react/constants": "^0.2.7",
+    "govuk-colours": "^1.0.3"
+  },
+  "devDependencies": {
+    "@govuk-react/storybook-components": "^0.2.4",
+    "as-nav-link": "^0.1.4"
+  },
+  "peerDependencies": {
+    "emotion": ">=9",
+    "prop-types": ">=15",
+    "react": ">=16.2.0",
+    "react-emotion": ">=9"
+  },
+  "scripts": {
+    "build": "npm run build:lib && npm run build:es",
+    "build:lib": "rimraf lib && babel src -d lib --source-maps",
+    "build:es": "rimraf es && cross-env BABEL_ENV=es babel src -d es --source-maps",
+    "docs": "doc-component ./lib/index.js ./README.md"
+  },
+  "main": "lib/index.js",
+  "module": "es/index.js",
+  "author": "Toby Brancher",
+  "license": "MIT",
+  "homepage": "https://github.com/stevesims/govuk-frederic/tree/master/components/page-navigation",
+  "description": "Page navigation component",
+  "private": false,
+  "publishConfig": {
+    "access": "public"
+  }
+}