adds eaccess fix

index.html

@@ -309,7 +309,7 @@ <h1>Install Tessel</h1>
               node</kbd></code>
               <p>Once Node.js is installed, run this installation
               script from your terminal<code><kbd>npm install -g
-              tessel</kbd></code></p>
+              tessel</kbd></code>. <i>If you get the common error shown <a href="http://stackoverflow.com/questions/16151018/npm-throws-error-without-sudo">here</a>, correct it by running <code><kbd>sudo chown -R $(whoami) ~/.npm</kbd></code> and then running <code><kbd>npm install -g tessel</kbd></code> again.</i></p>
               <p>If the installation didn't work, please post the
               error message to our <a href=
               "http://forums.tessel.io/category/installation-issues">
@@ -428,9 +428,9 @@ <h3 id="firmware">Update Tessel's Firmware</h3>
     </section>
   </footer>
   <script src="http://include.reinvigorate.net/re_.js">
-  </script> 
+  </script>
   <script src="javascripts/reinvigorate.js">
-  </script> 
+  </script>
   <script>
   $(document).foundation();
   </script>