Changes dropdown code to be consistent with bootstrap 3
Merge pull request #45 from shadowmaru/gh-pages

Changes class names in the examples to use bootstrap 3 classes:

* ```input-append``` for ```input-group```
* ```input-large``` for ```form-control```
* ```add-on``` for ```input-group-add-on```
* ```icon-calendar``` for ```glyphicon glyphicon-calendar```