add d3 lib
add 3 d3 chart
add chart.js
merge
shift mail feature
add story 1
story expand
add story tab title
some css may have problems
Merge branch 'develop' into Yo

* develop:
  add story tab title
  story expand
  add story 1
  shift mail feature
  add chart.js
  add 3 d3 chart
  add d3 lib

Conflicts:
	app/assets/javascripts/welcome_index.js
	app/assets/stylesheets/style.css
	app/views/welcome/index.html.erb