add sidebar column; fixed main column float bug

cms/static/sass/_unit.scss

@@ -4,6 +4,7 @@
 }
 
 .main-column {
+  clear: both;
   float: left;
   width: 70%;
 }

cms/templates/course_info.html

@@ -11,7 +11,6 @@
   
   <script type="text/javascript" charset="utf-8">
   $(document).ready(function(){
-  
     var course_updates = new CMS.Models.CourseUpdateCollection();
     course_updates.reset(${course_updates|n});
     course_updates.urlbase = '${url_base}';
@@ -33,6 +32,7 @@
   <div class="main-wrapper">
     <div class="inner-wrapper">
       <h1>Course Info</h1>
+      <div class="main-column">
         <article class="unit-body window" id="course-update-view">
           <h2>Updates</h2>
           <a href="#" class="new-update-button">New Update</a>
@@ -40,6 +40,10 @@
           <!-- probably replace w/ a vertical where each element of the vertical is a separate update w/ a date and html field -->
         </article>
       </div>
+      <div class="sidebar window">
+        handouts go here
+      </div>
+    </div>
   </div>
   </div>
 </%block>
\ No newline at end of file