added ability to "extend" helpers
* modified Loader to check for prefixed helpers in application/helpers folder
* surrounded provided helper functions with if (! function_exists('foo')) conditionals so the user's helper functions take precedent.
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index d8a6740..d029f32 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -129,6 +129,7 @@
 	

 	<li>Helpers &amp; Plugins

 		<ul>

+			<li>Added ability to <a href="./general/helpers.html">"extend" Helpers</a>.</li>

 			<li>Added an <a href="./helpers/email_helper.html">email helper</a> into core helpers.</li>

 		    <li>Added <kbd>strip_quotes()</kbd> function to <a href="./helpers/string_helper.html">string helper</a>.</li>

 		    <li>Added <kbd>reduce_multiples()</kbd> function to <a href="./helpers/string_helper.html">string helper</a>.</li>