twitter/bootstrap — pull request #5984 by mpnkhan (2012-11-22 09:15:37+00:00)
Title: Shifting focus to parent and adding aria menuitem for dropdown

Focus shifting to parent anchor when the drop down closed so that it is not problematic for Low Vision user and Keyboard only user.
Also added aria menuitem, seperator and presentation to anchor and list item so that it is announced approproiately for screen reader user.
Tested with NVDA and Jaws on Windows and Voiceover on Mac..