"Twitter Bootstrap" is now simply Bootstrap

See http://getbootstrap.com/about/#brand
fix typo
Merge pull request #377 from cvrebert/master

"Twitter Bootstrap" is now simply Bootstrap
Updated README.md
Merge pull request #379 from andyengle/master

Updated README.md
Adds custom rendering capability at the cell level
Merge pull request #446 from xcambar/feature/custom_column_rendering

Feature/custom column rendering