把之前在另外一个版本上做的东西移植到该版本下，正在重构blog那一块。（先备份目前的东西）
Add blog and comment models
Merge by wzw
commit routes
Merge branch 'master' of github.com:jie-zhang/gomelon into test
Merge branch 'master' into test
update blog and comment tab
add comment and blog model
Merge pull request #8 from wzw1991/master

zewen-wu's blog module and comment module.