"Twitter Bootstrap" => "Bootstrap"

Per https://github.com/twbs/bootstrap/issues/9899
Bootstrap v3.1.0+ is MIT-licensed

See:
* http://blog.getbootstrap.com/2014/01/30/bootstrap-3-1-0-released/
* https://github.com/twbs/bootstrap/issues/2054#issuecomment-30894685
Merge pull request #70 from cvrebert/master

update Bootstrap's name & license