added terabytes to number helper
added number helper guide pages, menus, toc, etc
diff --git a/user_guide/nav/nav.js b/user_guide/nav/nav.js
index e824299..81a564c 100644
--- a/user_guide/nav/nav.js
+++ b/user_guide/nav/nav.js
@@ -110,6 +110,7 @@
'<li><a href="'+base+'helpers/form_helper.html">Form Helper</a></li>' +
'<li><a href="'+base+'helpers/html_helper.html">HTML Helper</a></li>' +
'<li><a href="'+base+'helpers/inflector_helper.html">Inflector Helper</a></li>' +
+ '<li><a href="'+base+'helpers/number_helper.html">Number Helper</a></li>' +
'<li><a href="'+base+'helpers/path_helper.html">Path Helper</a></li>' +
'<li><a href="'+base+'helpers/security_helper.html">Security Helper</a></li>' +
'<li><a href="'+base+'helpers/smiley_helper.html">Smiley Helper</a></li>' +