move editor view into dashboard directory
reorganize assets file
organize partials
update editor's ui
some changes on editor's ui

Add sidebar for article operation
add a article_edit_tag helper
remove useless js files
fix a bug in views
Add an input for article's title
add return to article list command
add save article command
fix a bug with Article#to_param

Article#to_param return a int when slug is empty, but it should return
a string.
organize dashboard's js files
add ArticleEdit for all editor actions
add settings modal
update gems & readme
update gems