add preventDefault support for all inital event types (show, close, hide, etc.) + fix small bug with scrollspy.last

Added -o- and -ms- prefixes to make the animated progress bars to work
in the latest/upcoming versions of IE and Opera.

Conflicts:
	docs/assets/bootstrap.zip
	docs/assets/css/bootstrap.css
	less/button-groups.less

fix other instances of mixins, swap use of box-shadow everywhere, include border-radius and transition

Conflicts:
	docs/assets/bootstrap.zip

The native box-shadow, background-clip and background-size instructions all take 1 or more arguments. In 1.3.0 LESS became arity aware, see https://gist.github.com/1933613. As a result the signatures of these mixins had to change a little.

Conflicts:
	docs/assets/bootstrap.zip

1. Added a missing comma to the input-append's form control stack () to fix border-radius
2. Add  to the .uneditable-input in forms to remove the float as we do with all other form controls

1. Removed broken and unused dropup examples from the navs/pills docs
2. New defaults for dropdown menus: all corners are rounded and always 1px offset from top unless otherwise specified
3. Refined active and open states for button dropdowns by adding a darker background color for each button variation when opened; also changed the opened dropdown-toggle's inset shadow to match that of an :active button
4. Generalized .dropdown.open to just .open, thus removing a few lines from button-groups.less.
5. Annnnnnnnnd I think that's it.

bump version numbers in css files to 2.0.3, break out responsive CSS into separate files for further customization