课程logo替换，邀请码样式更改，班级路径显示主讲教师

app/views/layouts/_course_base_info.html.erb

@@ -3,6 +3,8 @@
 <% student_num = studentCount(@course) %>
 <% course_file_num = visable_attachemnts_incourse(@course).count %>
 <p class="sy_cgrey mb10">
+  <%= link_to(@course.teacher.show_name, user_path(@course.teacher), :class => 'sy_cgrey') %>
+  &nbsp;&gt;&nbsp;
   <% if @course.syllabus %>
       <%=link_to @course.syllabus.title, syllabus_path(@course.syllabus_id), :class => 'sy_cgrey' %>
       &nbsp;&gt;&nbsp;

public/stylesheets/syllabus.css

@@ -323,9 +323,10 @@ a.sy_class_option:hover {
     height:110px;
 }
 .sy_class_id{
-    width:110px;
+    width:108px;
-    height:80px;
+    height:78px;
-    background:#f1f1f1;
+    border:1px solid #f1f1f1;
+    background:#fff;
     text-align:center;
     padding-top:30px;
 }