Ready with minor issues, tested in IE8-IE10 and latest Chrome, Firefox, Opera (tested on Mac).

Known issues:

 * there is no .select2-chosen in Select2 v.3.3.2, thus no padding and line-height – not ready for 3.3.2 yet
 * IE9/IE10: Select2 in "Bootstrap Input Group" misses 1px in height (bug inherited from Bootstrap 3, @see http://getbootstrap.com/components/#input-groups-sizing)
 * IE9/IE10: Select2 in "Bootstrap Input Group with Button addon" also misses 1px in height (bug _not_ inherited from Bootstrap 3)
 * focus and box-shadow for .select2-search input do not fit Bootstrap's defaults
 * Select2 dropdown could inherit look-and-feel from Bootstrap dropdowns
 * checkboxes and radio-buttons in "Bootstrap Input Groups" could be vertically aligned to the top (instead of center) if combined with a multi Select2 to address variable height of the Select2 container
 * examples-page label=for and select#ids are a mess