Merge pull request #13786 from twbs/fat-13430

add special transitionend type to test event origin

diff --cc js/alert.js
Simple merge

diff --cc js/carousel.js
Simple merge

diff --cc js/collapse.js
Simple merge

diff --cc js/modal.js
Simple merge

diff --cc js/tab.js
Simple merge

diff --cc js/tooltip.js
Simple merge

diff --cc js/transition.js
Simple merge