update navigation and templates to include a class for nav so we can select…

update navigation and templates to include a class for nav so we can select currently active nav item

courseware.html

@@ -23,7 +23,7 @@
     });
 </script>
 
-<%include file="navigation.html" />
+<%include file="navigation.html" args="active_page='courseware'" />
 
 <section class="main-content">
   <div class="course-wrapper">

info.html

 <%inherit file="main.html" />
 
-<%include file="navigation.html" />
+<%include file="navigation.html" args="active_page='info'" />
 
 <section class="main-content">
   <div class="profile-wrapper">

navigation.html

+<%page args="active_page" />
 <div class="header-wrapper">
   <header>
     <h1><em>MITx</em></h1>
 
-    <nav>
+    <nav class="${active_page}">
       <h2><a href="/courseware">Circuits and Electronics</a></h2>
 
       <ul class="coursenav">
-        <li><a href="/courseware">Courseware</a></li>
-        <li><a href="/info">Course Info</a></li>
-        <li><a href="/book">Textbook</a></li>
-        <li><a href="/discussion">Discussion</a></li>
-        <li><a href="/wiki">Wiki</a></li>
-        <li><a href="/profile">Profile</a></li>
+        <li class="courseware"><a href="/courseware">Courseware</a></li>
+        <li class="info"><a href="/info">Course Info</a></li>
+        <li class="book"><a href="/book">Textbook</a></li>
+        <li class="discussion"><a href="/discussion">Discussion</a></li>
+        <li class="wiki"><a href="/wiki">Wiki</a></li>
+        <li class="profile"><a href="/profile">Profile</a></li>
       </ul>
     </nav>
   </header>

profile.html

@@ -62,7 +62,7 @@ $(function() {
 
 </script>
 
-<%include file="navigation.html" />
+<%include file="navigation.html" args="active_page='profile'" />
 
 <section class="main-content">
   <div class="profile-wrapper">

simplewiki_base.html

@@ -73,7 +73,7 @@
   <%block name="wiki_head"/>
 </%block>
 
-<%include file="navigation.html" />
+<%include file="navigation.html" args="active_page='wiki'" />
 
 <section class="main-content">
   <div class="wiki-wrapper">

staticbook.html

@@ -34,7 +34,7 @@ function next_page() {
 }
 </script>
 
-<%include file="navigation.html" />
+<%include file="navigation.html" args="active_page='book'" />
 
 <section class="main-content">
   <div class="book-wrapper">