Add demo/ path

fix #7
Bump jekyll

use only html for static website
Improve Gruntfile.js

set server with watch and connect task
Update package.json

add ~contrib-connect and ~watch modules
Bump old jekyll

use only html with grunt:connect / livereload
Add dist css & js main file
Add grunt-sass task
Add scss/base path

with color, font, mixins and scaffold files
Add scss/component path

with header-shrink and overlay-page file
Add scss/custom path

with scaffold and header-shrink file
Add scss/build file

with base, component and custom paths
Update bower.json

add some dependencies
Update index.html

bump jekyll use only html&grunt :pray: