docs(docs): change "Twitter Bootstrap" to "Bootstrap"

change "Twitter Bootstrap" to "Bootstrap" in readme.md per per http://getbootstrap.com/about/#brand
fix(app): change "Twitter Bootstrap" to "Bootstrap"

change "Twitter Bootstrap" to "Bootstrap" per http://getbootstrap.com/about/#brand
Merge pull request #592 from cvrebert/master

"Twitter Bootstrap" is now simply Bootstrap