Add Prettier Formatting (#258)

* Add Prettier formatting to source files and example files, and check that Prettier formatting is maintained on PRs

* Remove trailing-comma as we are using Node 6 on Circle

* Use latest Node 6 LTS version in Circle

* Remove unused test

examples/basics/siteConfig.js

@@ -8,49 +8,47 @@
 /* List of projects/orgs using your project for the users page */
 const users = [
   {
-    caption: "User1",
-    image: "/test-site/img/docusaurus.svg",
-    infoLink: "https://www.example.com",
-    pinned: true
-  }
+    caption: 'User1',
+    image: '/test-site/img/docusaurus.svg',
+    infoLink: 'https://www.example.com',
+    pinned: true,
+  },
 ];
 
 const siteConfig = {
-  title: "Test Site" /* title for your website */,
-  tagline: "A website for testing",
-  url: "https://deltice.github.io" /* your website url */,
-  baseUrl: "/test-site/" /* base url for your project */,
-  projectName: "test-site",
+  title: 'Test Site' /* title for your website */,
+  tagline: 'A website for testing',
+  url: 'https://deltice.github.io' /* your website url */,
+  baseUrl: '/test-site/' /* base url for your project */,
+  projectName: 'test-site',
   headerLinks: [
-    { doc: "doc1", label: "Docs" },
-    { doc: "doc4", label: "API" },
-    { page: "help", label: "Help" },
-    { blog: true, label: "Blog" }
+    {doc: 'doc1', label: 'Docs'},
+    {doc: 'doc4', label: 'API'},
+    {page: 'help', label: 'Help'},
+    {blog: true, label: 'Blog'},
   ],
   users,
   /* path to images for header/footer */
-  headerIcon: "img/docusaurus.svg",
-  footerIcon: "img/docusaurus.svg",
-  favicon: "img/favicon.png",
+  headerIcon: 'img/docusaurus.svg',
+  footerIcon: 'img/docusaurus.svg',
+  favicon: 'img/favicon.png',
   /* colors for website */
   colors: {
-    primaryColor: "#2E8555",
-    secondaryColor: "#205C3B"
+    primaryColor: '#2E8555',
+    secondaryColor: '#205C3B',
   },
   // This copyright info is used in /core/Footer.js and blog rss/atom feeds.
   copyright:
-    "Copyright © " +
+    'Copyright © ' +
     new Date().getFullYear() +
-    " Your Name or Your Company Name",
+    ' Your Name or Your Company Name',
   highlight: {
     // Highlight.js theme to use for syntax highlighting in code blocks
-    theme: "default"
+    theme: 'default',
   },
-  scripts: [
-    "https://buttons.github.io/buttons.js"
-  ],
+  scripts: ['https://buttons.github.io/buttons.js'],
   // You may provide arbitrary config keys to be used as needed by your template.
-  repoUrl: "https://github.com/deltice/test-site",
+  repoUrl: 'https://github.com/deltice/test-site',
 };
 
 module.exports = siteConfig;