ie8: update test cases + readme

* popover test case
* accordian test case (failing)
Fix infinite render loop in `CollapsableMixin` in non-CSS
transition supporting browsers (ie: ie8/9)
Fix `Carousel` examples for ie8
Merge pull request #137 from react-bootstrap/ie8-accordion

Ie8 accordion
Merge pull request #140 from react-bootstrap/ie8-carousel
IE8 test page cleanup

Removed unnecessary whitespace.
Added semicolons.
Require individual components.
Upgrade affix component event binding to use React EventListener
Merge pull request #142 from pieterv/ie8-test-cleanup

IE8 test page cleanup
Merge pull request #143 from pieterv/affix-event-binding

Upgrade affix component event binding to use React EventListener