Add links from example site to GitHub and NPM.

Author: ethanselzer

example/images/github-logo.png

@@ -4,35 +4,35 @@
 
    <url>
       <loc>https://ethanselzer.github.io/react-lazy-tree/</loc>
-      <lastmod>2017-01-27</lastmod>
+      <lastmod>2017-01-30</lastmod>
       <changefreq>weekly</changefreq>
       <priority>1</priority>
    </url>
 
    <url>
       <loc>https://ethanselzer.github.io/react-lazy-tree/#/Hamburger</loc>
-      <lastmod>2017-01-27</lastmod>
+      <lastmod>2017-01-30</lastmod>
       <changefreq>weekly</changefreq>
       <priority>.08</priority>
    </url>
 
    <url>
       <loc>https://ethanselzer.github.io/react-lazy-tree/#/Hamburger/Touch</loc>
-      <lastmod>2017-01-27</lastmod>
+      <lastmod>2017-01-30</lastmod>
       <changefreq>weekly</changefreq>
       <priority>.05</priority>
    </url>
 
    <url>
       <loc>https://ethanselzer.github.io/react-lazy-tree/#/Catalog/Women/Clothing/Dresses/Work</loc>
-      <lastmod>2017-01-27</lastmod>
+      <lastmod>2017-01-30</lastmod>
       <changefreq>weekly</changefreq>
       <priority>.08</priority>
    </url>
 
    <url>
       <loc>https://ethanselzer.github.io/react-lazy-tree/#/Viewer</loc>
-      <lastmod>2017-01-27</lastmod>
+      <lastmod>2017-01-30</lastmod>
       <changefreq>weekly</changefreq>
       <priority>.08</priority>
    </url>

example/images/npm-logo.png

@@ -1,6 +1,11 @@
 import React from 'react';
 import { Navbar, Nav, NavItem } from 'react-bootstrap';
 
+import npmLogo from '../../images/npm-logo.png';
+import githubLogo from '../../images/github-logo.png';
+
+import '../../styles/header.css';
+
 class Navigation extends React.Component {
     constructor(props) {
         super(props);
@@ -51,6 +56,22 @@ class Navigation extends React.Component {
                         <NavItem eventKey={3} href="#/Catalog/Women/Clothing/Dresses/Work">Category</NavItem>
                         <NavItem eventKey={4} href="#/Viewer">Viewer</NavItem>
                     </Nav>
+                    <Nav pullRight>
+                        <NavItem
+                            eventKey={1}
+                            className="github-link"
+                            href="https://github.com/ethanselzer/react-lazy-tree"
+                        >
+                            <img src={githubLogo} alt="GitHub Logo" />
+                        </NavItem>
+                        <NavItem
+                            eventKey={2}
+                            href="https://www.npmjs.com/package/react-lazy-tree"
+                            className="npm-link"
+                        >
+                            <img src={npmLogo} alt="NPM Logo" />
+                        </NavItem>
+                    </Nav>
                 </Navbar.Collapse>
             </Navbar>
         );

example/public/sitemap.xml

@@ -0,0 +1,26 @@
+.github-link img {
+    width: 32px;
+}
+
+.npm-link img {
+    height: 32px;
+}
+
+.navbar-nav > li.npm-link > a {
+    padding: 0 0 0 14px;
+}
+
+.navbar-nav > li.github-link > a {
+    padding: 0 0 10px 14px;
+}
+
+@media (min-width: 768px) {
+    .navbar-nav > li.github-link > a {
+        padding: 10px 0 5px 0;
+        margin-right: 20px;
+    }
+
+    .navbar-nav > li.npm-link > a {
+        padding: 11px 0 5px 0;
+    }
+}