correct sidebar title to monospace

ul archive list style to circle

fix_sidebar_style

redundant CSS resolved, corrected class names in archives_sidebar view

Author: tbduong

lib/archives_sidebar/app/views/archives_sidebar/_content.html.erb

@@ -1,6 +1,6 @@
 <% unless sidebar.archives.blank? %>
-  <h3 class="sidebar_title"><%= sidebar.title %></h3>
-  <div class="sidebar_body">
+  <h3 class="sidebar-title"><%= sidebar.title %></h3>
+  <div class="sidebar-body">
     <ul id="archives">
       <% sidebar.archives.each do |month| %>
         <% counter = sidebar.show_count ? "<em>(#{month[:article_count]})</em>" : "" %>