修改logo图片，点击图片和版块名称分别到达首页和相应版块
优化搜索按钮
优化
Merge remote-tracking branch 'guide/bug_newNav140513' into bug_newNav140513

Conflicts:
	themes/web/views/layouts/main.php
新增删除入口
Merge remote-tracking branch 'guide.git/bug_newNav140513' into bug_newNav140513
增加网站首页设置