Use appendChild instead of insertBefore for a small perfomance boost

- Fixes #11

dotjs.js

@@ -3,17 +3,17 @@ var hostname = location.hostname.replace(/^www\./, '');
 var style = document.createElement('link');
 style.rel = 'stylesheet';
 style.href = chrome.extension.getURL('styles/' + hostname + '.css');
-document.documentElement.insertBefore(style);
+document.documentElement.appendChild(style);
 
 var defaultStyle = document.createElement('link');
 defaultStyle.rel = 'stylesheet';
 defaultStyle.href = chrome.extension.getURL('styles/default.css');
-document.documentElement.insertBefore(defaultStyle);
+document.documentElement.appendChild(defaultStyle);
 
 var script = document.createElement('script');
 script.src = chrome.extension.getURL('scripts/' + hostname + '.js');
-document.documentElement.insertBefore(script);
+document.documentElement.appendChild(script);
 
 var defaultScript = document.createElement('script');
 defaultScript.src = chrome.extension.getURL('scripts/default.js');
-document.documentElement.insertBefore(defaultScript);
+document.documentElement.appendChild(defaultScript);