微调颜色;
支持Topic编辑
Merge pull request #339 from suffering/patch-1

支持Topic编辑
全站正文格式统一成 markdown-body，并微调细节;
@, floor 颜色微调;
CSS name from _ to -
Rails 4.0.5
GoTop 样式微调;
.reply 用 clearfix 修复行高;
Fix #322 & Test
conside delete replies when reply via ajax
Use JS to fix #334
Merge pull request #341 from zlx/bugfix/322

Fix #322 & Test
Add new space between floor num and 楼
Fix conflict
Merge branch 'zlx-bugfix/334'
处理所有异常的路由，给出 404，避免 Log 里面一堆混乱的东西;
修正老浏览器 Cookie 因为 Rails 4.1 改变 Cookie 算法导致后台捕捉到非常多 JSON::ParserError: 795: unexpected token at session_id:EFI 的问题 https://github.com/rails/rails/issues/15111
Topics 分页 :page 的调用防止出错;
增加 Rack::UTF8Sanitizer