Replace pygments with rouge in Gemfile.

Rouge is a pure-ruby syntax highlighter and compatible with stylesheets
designed for pygments but no need to spawn Python processes.
Merge pull request #155 from lgn21st/master

我来跑跑试试
Code highlight Ruby and RUBY as ruby language.
1. Add cache_digests gem;
2. Russian Doll caching for Reply list;
3. Disbale etag in development;
Nokogiri require.
Add God to protected Sidekiq progress.
Fix Sidekiq stop command in god config file.
Rails 3.2.13.
Merge pull request #157 from lgn21st/master

忘了合并
Fix #159;
Security bug fix.
增加 user.newbie? 方法判断用户是否是新手 #160，新手不允许发帖;
前台页面出现新手提示，并且新手不出现发帖按钮; #160
个人主页的用户等级显示文案修改;
修改 Unicorn 配置的路径; #154
use max-width to avoid overflow long text.

see #159 and 50a89a2c52bc9742196dddd16c1c7abbfbf3a152
新手期改为 1 周;
管理员修改过帖子的节点以后，用户将不可再次修改节点，此功能以配合转移节点，并让部分节点不在首页显示；
Fix #159 and b32e8fc56192c8fff91df10d76be55fcc64498dc style in mobile view.
 add not_found_in_database in devise locales