[docs] Update _config.yml

add /Tupi baseurl
[docs] Update _layouts/default.html

add {{ site.baseurl }} in link stylesheet
Update .gitignore

use _site -> _gh_pages
Update _config.yml

bump unecessary values
Update README.md

add devDependencies badge
Update package.json

update grunt-contrib-jshint 0.10.0 -> 0.9.2
Add .travis.yml

with node_js: 0.10
Update README.md

add build badge
[docs] Update _layouts/default.html

bump {{ site.baseurl }}