课程主页新建课程按钮，修改为所有人都可以看到

app/views/welcome/_more_course.html.erb

@@ -1,8 +1,6 @@
 <% if User.current.logged?%>
-    <% if User.current.user_extensions.identity == 0 %>
         <%= link_to(l(:label_course_new), {:controller => 'courses', :action => 'new'},
                     :class => 'icon icon-add') if User.current.allowed_to?(:add_course,nil, :global => true) %>
-    <% end %>
     &nbsp;&nbsp;&nbsp;&nbsp;
     <%= link_to l(:label_course_join_student), join_private_courses_courses_path ,:remote => true, :class => 'icon icon-add' %>
     &nbsp;&nbsp;&nbsp;&nbsp;