Fix listsorter accessbility bug when trigger is not passed in.
Remove "parent" attribute in menuList.cmp, menuItem.cmp, and menuTrigger.cmp
update listSorter to use aura:iteration
Disable "testRichTextInvalidDimensions" test for IE7 and IE8
Hide radioMenuItem if "hideMenuAfterSelected" is set to true.
Merging origin/john/master-pending/cherry-pick-192 into master