Merge pull request tessel#8 from tessel/kb-add

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">