add gem devise
header html
devise setting
add post controller , model
add posts controller , model
Merge branch 'feature/add_devise' into develop
simple_blog post CRUD
post CRUD
add some test gem
add controller test
Merge branch 'feature/simple_blog' into develop
version 1 
comment by post
add cell comment
1.add css foler design
2.add css : post index
1.add like model 
2.add like controller
1. refactor view : like , commend
refactor
Merge branch 'feature/comment_like_system' into develop
1. add CarrierWave
test some rich editor
Revert "test some rich editor"

This reverts commit 067b2cf94260cd64cde9b05eb29dd7b7de222a6e.